What is the difference between direct-drive and belt-drive HAM models?

Models from HAM-40 to HAM-90 (400–900 mm) are direct-drive units operating on 220V 1-phase 60Hz where the blade mounts directly on the motor shaft. Models from HAM-106 to HAM-153 (1,060–1,530 mm) are heavy-duty belt-drive fans operating on 380V 3-phase 60Hz, where a 4-pole motor drives the large blade at ~430–580 RPM through a V-belt pulley to maximize airflow torque, energy efficiency, and quiet operation.

How does the heavy hammer centrifugal shutter mechanism work?

Unlike passive gravity louvers that rely purely on air pressure to push shutters open, the DEMO HAM series uses a centrifugal drop-hammer mechanism. When the fan rotates, centrifugal weights swing outward, mechanically forcing the shutter louvers to a full 90° horizontal open position. This eliminates air resistance during operation and ensures a tight gravity seal when the fan stops.

How do I determine the number of fans required for a poultry house?

Poultry tunnel ventilation requires calculating the building cross-sectional area (Width × Average Height in feet) and multiplying by the target air speed (typically 500 to 600 ft/min / 2.5 to 3.0 m/s). Divide this total required CFM by the fan's operating capacity at 25–30 Pa static pressure (e.g. HAM-138 or HAM-153) to determine the exact number of exhaust fans.

How do evaporative cooling pads affect fan selection?

Evaporative cooling pads create negative static pressure resistance (typically 20 to 30 Pa). You must provide sufficient cooling pad face area so intake air velocity stays between 1.0 and 1.25 m/s (200–250 ft/min). Undersizing the pads increases static pressure, which decreases fan airflow and causes motor strain.

Are DEMO HAM fans suitable for Saudi Arabia 60 Hz electrical supplies?

Yes. All DEMO HAM models supplied by Cloud Electricals are configured for Saudi Arabian 60 Hz power: 220V single-phase for compact direct-drive sizes (HAM-40 through HAM-90) and 380V three-phase for large industrial belt-drive sizes (HAM-106 through HAM-153).

What routine maintenance is required for belt-drive shutter fans?

Maintenance includes: (1) monthly wiping of dust, feathers, and lint from blades and shutter pivot pins; (2) quarterly checking and tensioning of the V-belt (10–15 mm deflection); (3) semi-annual lubrication of bearing grease points; and (4) annual checking of motor electrical running current and wall mounting bolts.

Can these fans be used for commercial kitchen grease or ducted exhaust?

No. HAM shutter fans are open wall-displacement fans designed for free-air or low negative-pressure exhaust. They cannot overcome significant ductwork static pressure and are not certified for grease-laden commercial kitchen hoods. For kitchen grease, select a centrifugal box fan or upblast roof fan.

How are multiple fans controlled in automated agricultural facilities?

In modern poultry houses and greenhouses, fans are staged into multiple groups controlled by an automated environmental controller or multi-stage thermostat. Group 1 provides minimum winter baseline ventilation, while subsequent groups stage on progressively as ambient temperature rises up to full summer tunnel ventilation.

What documents are provided for contractor and consultant approval?

We provide the authorized Cloud Electricals DEMO HAM technical catalog PDF, dimensional submittal drawings, performance ratings, and Saudi commercial compliance documentation (CR, VAT, ISO, COC) upon quotation request.

DEMO HAM Heavy Hammer Series

DEMO HAM Wall Mounted Shutter Exhaust Fan

High-CFM belt-drive and direct-drive wall mounted shutter exhaust fans for agricultural poultry houses, commercial greenhouses, livestock barns, and large open-building industrial ventilation in Saudi Arabia.

Request Quote on WhatsApp Call Technical Sales Download HAM Catalog

In brief

What is a DEMO HAM shutter exhaust fan?

A DEMO HAM shutter exhaust fan is a heavy-duty, high-volume wall exhauster equipped with an automatic centrifugal heavy-hammer shutter mechanism, hot-dip galvanized frame (275 g/m²), and stainless steel blades. Sized by required building air exchange (ACH) or poultry tunnel air velocity (m/s) at operating static pressure (20–30 Pa with cooling pads), not free-air ratings alone.

DEMO HAM wall mounted shutter exhaust fan with galvanized frame and stainless steel blades

DEMO HAM Shutter Exhaust Fan

Agricultural & poultry ventilation

Verified 60 Hz motor options

High-CFM Saudi project supply

DEMO HAM Shutter Exhaust Fan

Fan Category

Wall Mounted Shutter Exhaust Fan

Product Series

DEMO HAM / Heavy Hammer Series

Airflow Range

1,530 – 26,250 Free-Air CFM (10 Models)

Drive Mechanism

Direct-Drive (40–90 cm) & V-Belt Drive (106–153 cm)

Housing & Blades

275 g/m² Galvanized Steel & 1.2 mm Stainless Steel

Electrical Supply

220V 1-Ph (HAM-40–90) & 380V 3-Ph (HAM-106–153) 60Hz

Application Check

Is a DEMO HAM shutter exhaust fan suitable for your facility?

Evaluate your building geometry, static pressure conditions, and ventilation goals before selecting direct-drive or belt-drive models.

Good fit

Poultry broiler and layer houses utilizing negative-pressure tunnel ventilation
Commercial agricultural greenhouses paired with evaporative cooling pads
Dairy and livestock breeding barns requiring high-volume air turnover
Open industrial warehouses, fabrication workshops, and metal processing plants

Confirm first

Total building negative static pressure (keep under 30 Pa with cooling pads)
Cooling pad intake free area to prevent high intake air velocity (> 1.5 m/s)
Multi-stage temperature and humidity controller coordination
3-phase 380V 60Hz electrical supply on large belt-drive models (HAM-106 to 153)
Scheduled maintenance access for routine V-belt tensioning and cleaning

Use another documented fan

Long ducted ventilation systems with high external static resistance (select Centrifugal Box Fan)
Explosion-proof or ATEX-classified flammable vapor or combustible dust airstreams
Acoustic-critical offices, clinics, or residential quiet spaces
Certified emergency fire smoke extraction (select VDO series)

Important application note: DEMO HAM shutter exhaust fans are direct wall-displacement ventilators designed for high air volume at low negative static pressure (< 40 Pa). In agricultural and greenhouse installations with evaporative cooling pads, the inlet pad free area must be sized correctly to prevent excessive negative pressure from starving the fans and reducing ventilation rates.

Drive Selection

Direct-Drive vs. Heavy-Duty Belt-Drive Selection

Understand the structural and electrical differences between compact direct-drive fans and high-volume agricultural belt-drive fans.

HAM-40 to HAM-90 (400 to 900 mm frame)

Direct-Drive Shutter Fans

1,530 to 13,417 CFM

Electrical Supply: 220V 1-Phase 60Hz

Mechanism: Impeller mounted directly on motor shaft; 1400/1700 RPM nominal speed

Best Application: Small workshops, storage buildings, equipment rooms, and localized spot exhaust

Maintenance Requirement: Minimal drive maintenance; wipe blades and clean shutter pivot pins

HAM-106 to HAM-153 (1,060 to 1,530 mm frame)

Heavy-Duty Belt-Drive Fans

18,083 to 26,250 CFM

Electrical Supply: 380V 3-Phase 60Hz

Mechanism: 4-pole motor stepped down via V-belt pulley to ~450–600 blade RPM with centrifugal drop hammer

Best Application: Poultry tunnel sheds, commercial greenhouses, dairy barns, and large factories

Maintenance Requirement: Routine V-belt tension checks (every 3–6 months) and bearing lubrication

Compact Models (220V 1-Phase)

Direct-Drive Shutter Exhaust Fan Models (HAM-40 to HAM-90)

Compact wall-mounted shutter exhaust fans featuring direct motor-shaft impellers for straightforward spot ventilation and workshops.

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Model	Voltage / Phase	Motor Power	Free Air CFM	Blade Diameter	Nominal RPM	Frame Dimensions (W×D×H)	Net Weight
HAM-40	220V 1-Ph 60Hz	0.25 kW (0.33 HP)	1,530 CFM	12" (300 mm)	1400 / 1700 RPM	400 × 320 × 400 mm	14 kg
HAM-50	220V 1-Ph 60Hz	0.25 kW (0.33 HP)	3,092 CFM	15" (375 mm)	1400 / 1700 RPM	480 × 360 × 480 mm	18 kg
HAM-60	220V 1-Ph 60Hz	0.37 kW (0.50 HP)	4,375 CFM	20" (500 mm)	1400 / 1700 RPM	600 × 360 × 600 mm	24 kg
HAM-70	220V 1-Ph 60Hz	0.37 kW (0.50 HP)	8,750 CFM	24" (600 mm)	1400 / 1700 RPM	700 × 380 × 700 mm	32 kg
HAM-80	220V 1-Ph 60Hz	0.37 kW (0.50 HP)	9,333 CFM	28" (710 mm)	1400 / 1700 RPM	800 × 380 × 800 mm	38 kg
HAM-90	220V 1-Ph 60Hz	0.37 kW (0.50 HP)	13,417 CFM	30" (760 mm)	1400 / 1700 RPM	900 × 380 × 900 mm	45 kg

Catalog Note: Direct-drive HAM-40 through HAM-90 models feature 220V single-phase 60Hz motors with the stainless steel impeller mounted directly on the motor shaft. Free-air CFM is tested at 0 Pa static pressure.

Heavy-Duty Agricultural Models (380V 3-Phase)

Heavy-Duty Belt-Drive Shutter Exhaust Fan Models (HAM-106 to HAM-153)

High-CFM agricultural and industrial tunnel ventilation fans featuring V-belt speed reduction and centrifugal heavy-hammer shutter mechanisms.

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Model	Voltage / Phase	Motor Power	Free Air CFM	Blade Diameter	Motor RPM	Blade RPM	Frame Dimensions (W×D×H)	Net Weight
HAM-106	380V 3-Ph 60Hz	0.55 kW (0.75 HP)	18,083 CFM	38" (965 mm)	1400 / 1700 RPM	~580 RPM	1,060 × 380 × 1,060 mm	58 kg
HAM-122	380V 3-Ph 60Hz	0.75 kW (1.00 HP)	21,000 CFM	44" (1,120 mm)	1400 / 1700 RPM	~520 RPM	1,220 × 380 × 1,220 mm	68 kg
HAM-138	380V 3-Ph 60Hz	1.10 kW (1.50 HP)	23,625 CFM	50" (1,270 mm)	1400 / 1700 RPM	~460 RPM	1,380 × 380 × 1,380 mm	82 kg
HAM-153	380V 3-Ph 60Hz	1.50 kW (2.00 HP)	26,250 CFM	56" (1,420 mm)	1400 / 1700 RPM	~430 RPM	1,530 × 380 × 1,530 mm	96 kg

Engineering Note: Belt-drive HAM-106 through HAM-153 models operate on 380V 3-phase 60Hz electrical supply. The 4-pole motor operates at nominal 1400/1700 RPM and drives the large stainless steel impeller through a cast pulley reduction system to ~430–580 RPM, delivering high aerodynamic torque, low vibration, and extended service life. Equipped with a heavy hammer centrifugal drop-weight mechanism that forces shutters completely open during operation.

Ventilation Engineering

Agricultural & Open-Building Ventilation Design Guide

Guidelines for calculating required airflow, target air velocities, and evaporative cooling pad free area across Saudi poultry and greenhouse projects.

Poultry Tunnel Ventilation Sizing

In broiler and layer housing, tunnel ventilation creates a cooling wind-chill effect across bird level during hot Saudi summers.

Total Exhaust CFM = House Cross-Section Area (sq. ft) × Target Air Velocity (500–600 ft/min / 2.5–3.0 m/s)

Design Rule: Select the quantity of HAM-138 or HAM-153 fans based on CFM delivered at 25–30 Pa negative pressure.

Commercial Greenhouse Air Exchange

Greenhouses require continuous air turnover to evacuate solar heat gain, regulate relative humidity, and replenish carbon dioxide.

Total Exhaust CFM = Greenhouse Internal Volume (cu. ft) × Air Changes Per Minute (0.75 to 1.5 ACH/min)

Design Rule: Coordinate with evaporative cooling pad banks on the opposite wall to ensure uniform laminar airflow across the crop canopy.

Evaporative Cooling Pad Coordination

Cooling pads provide evaporative temperature depression but create static pressure resistance.

Pad Free Area (sq. ft) = Total Fan CFM ÷ Design Pad Face Velocity (250 ft/min / 1.25 m/s)

Design Rule: Undersized cooling pad area causes excessive negative pressure (> 35 Pa), reducing fan airflow and causing motor overload.

Engineering Features

Key Features for Heavy-Duty Wall Ventilation

Designed for long service life in demanding agricultural, greenhouse, and industrial environments across Saudi Arabia.

Hot-dip galvanized steel frame with verified 275 g/m² zinc layer for corrosion resistance

1.2 mm thick high-grade stainless steel blades formed with aerodynamic curvature and dynamic balance

Centrifugal heavy hammer mechanism guarantees complete 90° shutter opening during fan operation

Gravity drop-weight closure seals the wall opening against rain, sandstorms, and bird entry when turned off

High-tensile V-belt transmission on large models reduces blade speed for high torque and low acoustic noise

Pure copper-wound IP55 sealed motor designed for continuous duty in high ambient temperatures (up to 55°C)

1.0 mm thick reinforced galvanized housing ensures rigid, vibration-free masonry or steel wall mounting

Full model range from 40 cm to 153 cm covering airflow requirements from 1,530 to 26,250 CFM

Specifications

Category Technical Specifications

Complete engineering specifications for DEMO HAM wall-mounted shutter exhaust fans.

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Specification	Engineering Details
Product Category	Wall Mounted Fan
Product Type	Wall Mounted Shutter Exhaust Fan
Brand / Series	DEMO HAM Heavy Hammer Series
Installation	Wall-mounted direct displacement opening
Model Range	HAM-40, HAM-50, HAM-60, HAM-70, HAM-80, HAM-90, HAM-106, HAM-122, HAM-138, HAM-153
Airflow Range	1,530 to 26,250 Free-Air CFM (approx. 2,600 to 44,600 m³/h)
Blade Diameters	12", 15", 20", 24", 28", 30", 38", 44", 50", 56"
Drive Configurations	Direct-Drive (HAM-40–90) / Heavy-Duty V-Belt Drive (HAM-106–153)
Electrical Supply	220V 1-Phase 60Hz (HAM-40–90) / 380V 3-Phase 60Hz (HAM-106–153)
Motor Specifications	Pure copper winding, Class F insulation, IP55 enclosure, continuous duty
Casing Construction	Hot-dip galvanized steel sheet, 275 g/m² zinc class, 1.0 mm thickness
Blade Construction	1.2 mm thick grade 430/304 stainless steel, stamped and dynamically balanced
Shutter Mechanism	Centrifugal heavy hammer drop-weight system with galvanized louvers
Applications	Poultry housing, dairy barns, greenhouses, agricultural sheds, warehouses, factories
Operating Pressure Duty	Free-discharge wall displacement (optimal operating range 0–35 Pa negative static)
Documentation	Authorized Cloud Electricals PDF catalog, submittal datasheets, compliance documents

Preventive Maintenance

Routine Service & Maintenance Schedule

Follow scheduled inspections to maintain optimal airflow, extend motor and belt life, and ensure tight shutter closure.

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Interval	Component / Area	Recommended Action
Monthly	Shutter Louvers & Blades	Wipe accumulated dust, feathers, and lint from shutter pivot pins and blade surfaces to prevent mechanical binding and aerodynamic imbalance.
Every 3 Months	V-Belt Tension & Wear	Check V-belt deflection (10–15 mm under moderate thumb pressure). Adjust motor base tension bolts if loose, and inspect for cracking or glazing.
Every 6 Months	Bearings & Centrifugal Hammer	Inspect bearing play and lubricate grease fittings if equipped. Ensure centrifugal drop hammer pivots freely without sticking.
Annually	Frame Anchors & Motor Electricals	Check wall anchor tightness and verify motor running current (FLA) using a calibrated clamp meter against nameplate ratings.

Applications

DEMO HAM Shutter Exhaust Fan Applications

High-CFM displacement ventilation across agricultural, greenhouse, warehouse, and heavy industrial facilities.

Poultry broiler & layer houses

Removes: Heat load, moisture, ammonia gas, and stale bird-room air via tunnel ventilation

Commercial greenhouses

Removes: Solar radiant heat, humidity excess, and stagnant air in pad-and-fan layouts

Dairy & livestock barns

Removes: Animal heat, moisture vapor, and odors to maintain herd comfort and milk yield

Agricultural crop storage

Removes: Trapped heat, condensation, and stagnant air across bulk storage sheds

Factory workshops & foundries

Removes: Welding fumes, equipment heat, and process dust through high-CFM wall displacement

Textile & manufacturing plants

Removes: Machinery heat, airborne fiber stagnation, and general building heat buildup

Logistics warehouses

Removes: Stratified high-bay heat and indoor air stagnation across large open floor areas

MEP agricultural projects

Removes: Sized by building geometry, target air velocity (m/s), and cooling pad coordination

Application boundary: HAM wall shutter fans are open wall-displacement exhausters. For commercial kitchen grease hoods, select a certified metal Centrifugal Box Inline Fan or Upblast Roof Fan. For ducted low-noise indoor washrooms, select a Plastic Inline Duct Fan.

Selection support

What to Send for Correct Selection

Share your building dimensions and agricultural parameters and our technical sales engineers will calculate exact fan quantities, air speeds, and quotation.

Building application: poultry house, commercial greenhouse, livestock barn, warehouse, or factory

Building dimensions: length × width × eave height (and ceiling peak height)

Target ventilation metric: target air speed across cross-section (m/s) or air changes per hour (ACH)

Evaporative cooling pad status: pad thickness (100 mm / 150 mm) and available pad area

Wall opening dimensions and structural framing (masonry block vs. structural steel siding)

Electrical power supply: 220V 1-phase 60Hz vs. 380V 3-phase 60Hz

Staging and control requirements: manual on/off switch, multi-stage thermostat, or automated PLC controller

Corrosion considerations: proximity to coast, chemical cleaning routines, or high ammonia concentration

Required fan quantity and planned spatial distribution along exhaust wall

Project city and delivery schedule in Saudi Arabia

Need for engineering submittal sheets, compliance certificates (CR, VAT, ISO, COC), or consultant approvals

Accessories

Wall Exhaust Fan Accessory Options

Coordinate wall mounting flanges, external weather hoods, evaporative cooling pads, and automated staging panels.

Galvanized Wall Mounting Flanges & Framing Kits

External Heavy-Duty Weather Hoods & Wind Deflectors

Inlet Evaporative Cooling Cellulose Pads & Distribution Systems

Multi-Stage Thermostatic & Humidity Automatic Control Panels

Spare High-Tensile V-Belt Sets & Motor Pulleys

Rear Safety Wire Finger Protection Guards

Downloads

Documents and Procurement Files

Authorized manufacturer technical catalogs, ventilation submittal sheets, and Saudi commercial compliance documents.

DEMO HAM Series Technical CatalogDownload PDF

Poultry & Greenhouse Sizing SubmittalRequest Submittal

Cloud Electricals Company ProfileRequest Profile

Saudi Commercial Compliance (CR/VAT/COC)Request Compliance Docs

Engineering Ventilation Selection SheetRequest Selection Sheet

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Roof Fan Category

Portable Ventilator Blower Fan

FAQ

Wall Mounted Shutter Fan Questions

Answers for poultry farm operators, greenhouse managers, MEP engineers, contractors, and facility procurement teams across Saudi Arabia.

A DEMO HAM shutter exhaust fan is a heavy-duty, high-CFM wall-mounted box fan equipped with an automatic centrifugal heavy-hammer shutter mechanism, hot-dip galvanized frame (275 g/m²), and stainless steel blades. It is designed for agricultural tunnel ventilation (poultry, livestock, greenhouses) and large open-building industrial exhaust.

Quotation Request

Request DEMO HAM Shutter Exhaust Fan Quotation

Send your building application, shed dimensions, target air speed or CFM, cooling pad status, electrical voltage, quantity, and project location in Saudi Arabia.

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DEMO HAM Wall Mounted Shutter Exhaust Fan

What is a DEMO HAM shutter exhaust fan?

Is a DEMO HAM shutter exhaust fan suitable for your facility?

Direct-Drive vs. Heavy-Duty Belt-Drive Selection

Direct-Drive Shutter Exhaust Fan Models (HAM-40 to HAM-90)

Heavy-Duty Belt-Drive Shutter Exhaust Fan Models (HAM-106 to HAM-153)

Agricultural & Open-Building Ventilation Design Guide

Key Features for Heavy-Duty Wall Ventilation

Category Technical Specifications

Routine Service & Maintenance Schedule

DEMO HAM Shutter Exhaust Fan Applications

Poultry broiler & layer houses

Commercial greenhouses

Dairy & livestock barns

Agricultural crop storage

Factory workshops & foundries

Textile & manufacturing plants

Logistics warehouses

MEP agricultural projects

What to Send for Correct Selection

Wall Exhaust Fan Accessory Options

Documents and Procurement Files

Related Ventilation Products

Wall Mounted Shutter Fan Questions

What is a DEMO HAM wall mounted shutter exhaust fan?

What is the difference between direct-drive and belt-drive HAM models?

How does the heavy hammer centrifugal shutter mechanism work?

How do I determine the number of fans required for a poultry house?

How do evaporative cooling pads affect fan selection?

Are DEMO HAM fans suitable for Saudi Arabia 60 Hz electrical supplies?

What routine maintenance is required for belt-drive shutter fans?

Can these fans be used for commercial kitchen grease or ducted exhaust?

How are multiple fans controlled in automated agricultural facilities?

What documents are provided for contractor and consultant approval?

Request DEMO HAM Shutter Exhaust Fan Quotation