Wall Fresh or Exhaust Air Fan — Manufacturer & Supplier, India
Vayuvents manufactures Wall Fresh Air and Exhaust Air Fans for through-wall industrial, agricultural, and commercial building ventilation. 300 mm to 1,200 mm dia, IS 3588. Mumbai. Call +91 90961 88703.
A Wall Fresh or Exhaust Air Fan is a propeller or tube axial fan mounted through the building wall — used for either fresh air supply (drawing outdoor air in) or exhaust ventilation (pushing stale or contaminated air out) depending on the motor direction and the fan placement. The same basic fan unit serves both duties in many installations.
Vayuvents manufactures wall fresh/exhaust fans from 300 mm to 1,200 mm diameter for industrial, agricultural, greenhouse, poultry, and commercial building applications. The through-wall mounting requires a circular wall penetration matching the fan casing diameter — the fan frame bolts directly to the wall face on both internal and external sides.
External face protection includes automatic back-draught shutters (gravity-operated louvres that close when the fan is stopped, preventing reverse airflow and rain ingress) and a weatherproof GI or aluminium louvred cowl. GI construction for standard indoor environments; aluminium or FRP for high-humidity, agricultural, and coastal environments.
Thermostat, humidistat, and timer control compatible. Single-phase 230V available for smaller sizes in locations without 3-phase supply.
Key Features & Benefits
High Free-Air Delivery
Large-diameter low-RPM impeller delivers maximum airflow per unit of power — essential for agricultural ventilation where continuous 24/7 operation must be energy-efficient.
IP55 Weatherproof Motor
IP55 TEFC motor withstands the high-humidity, ammonia-laden, and dusty environments of greenhouse and poultry farming without motor winding damage.
Thermostat Control
Thermostat and humidistat control options allow fully automatic fan operation — fans switch on/off based on temperature or humidity setpoint without manual intervention.
Corrosion Resistant
Aluminium, FRP, and PP construction options for the high-humidity and high-ammonia environments of intensive poultry and livestock housing.
Low Noise Operation
Carefully selected low-RPM motor and blade profile minimise noise — important for poultry and greenhouse environments where high noise causes animal stress.
Uniform Air Distribution
Multiple fans arranged at calculated spacing ensure uniform air movement across the full building length — eliminating hot and stagnant pockets.
Energy Efficient EC Option
EC (electronically commutated) motor option provides variable speed proportional control — reduces energy consumption by 30 to 50% compared to fixed-speed motors.
IS 3588 Compliant
Airflow performance tested per IS 3588-1987 with test certificate confirming stated ventilation performance.
Technical Specifications
| Parameter | Specification |
|---|---|
| Fan Diameter Range | 300 mm to 1,400 mm |
| Airflow (Free Air) | 3,000 m³/hr to 60,000 m³/hr |
| Motor Power Range | 0.25 HP to 5.0 HP |
| Motor Speed | 960 / 1,440 RPM |
| Motor Enclosure | IP55 TEFC |
| Blade Material | Aluminium alloy / FRP / PP |
| Casing / Frame | GI / Aluminium / FRP |
| Power Supply | 415V 3-Phase / 230V Single-Phase |
| Control | Thermostat / Humidistat / Timer / Manual |
| Standards | IS 3588-1987 | IS 4894 |
Product Images
Where It Is Used
- Greenhouse sidewall fresh air supply and exhaust ventilation
- Poultry house exhaust fans for tunnel and cross ventilation
- Factory sidewall ventilation — fresh air supply and heat exhaust
- Warehouse through-wall cross ventilation
- Laboratory exhaust ventilation through external wall
- Kitchen and canteen cooking fume exhaust
- Server room and electrical room heat exhaust
- Battery charging room hydrogen exhaust
- Chemical storage building solvent vapour exhaust
- Cold storage facility through-wall defrost air circulation
- Agricultural storage building grain and produce ventilation
- Residential and commercial building general through-wall ventilation
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FAQs — Wall Fresh or Exhaust Air Fan
The required number of fans depends on the building volume and required air change rate. For broiler poultry, 1 air change per minute (60 per hour) at peak summer is the standard — a 120 m × 12 m × 3 m broiler house (4,320 m³) needs approximately 4,320 m³/min = 2,59,200 m³/hr, requiring 6 to 8 fans of 1,200 mm diameter (each providing 35,000 to 40,000 m³/hr). Vayuvents provides free fan count and layout calculations based on your building dimensions.
Tunnel ventilation places all exhaust fans at one end gable and all air inlets at the other end — creating a high-velocity airstream along the full building length. This is more effective for bird cooling in hot climates. Cross ventilation places fans on one long wall exhausting through the opposite long wall — lower velocity but simpler ducting. Tunnel ventilation is the modern standard for commercial broiler and layer houses in India.
Poultry house environments have high humidity (60 to 90% RH), ammonia from litter (up to 25 ppm), and fine dust from feathers and litter — all of which corrode standard MS fan components. Vayuvents recommends aluminium or FRP blades and aluminium or FRP casing for poultry fans. IP55 motor enclosure prevents ammonia and dust from entering motor windings. Full aluminium or FRP cowl frames are preferred over galvanised steel in high-ammonia environments.
Yes. EC (electronically commutated) motor fans provide proportional speed control — the fan runs at exactly the speed required to maintain the setpoint temperature, rather than switching on at full speed and off completely. This provides better temperature stability, reduces energy consumption by 30 to 50%, and reduces mechanical stress from frequent start-stop cycling. Vayuvents supplies EC motor fan options for modern climate-controlled poultry and greenhouse installations.
Standard installations use a multi-stage thermostat controller that switches fan banks on in sequence as temperature rises — Stage 1 fans at 26°C, Stage 2 at 28°C, Stage 3 at 30°C, and so on. Modern climate controllers (Munters, Fancom, Skov) provide continuous proportional control of EC fans alongside pad cooling, heating, and lighting. Vayuvents fans are compatible with all standard thermostat and climate controller systems.
In tunnel ventilation systems, the total inlet area must be sufficient for the inlet air velocity to not exceed 2.0 to 2.5 m/s to avoid turbulence and dead zones. For 2,59,200 m³/hr total exhaust airflow, the required inlet area is approximately 2,59,200 / 3,600 / 2.0 = 36 m². Evaporative cooling pads are sized to this area. Vayuvents provides full inlet sizing guidance alongside fan selection.
Contact Vayuvents at enquiry@vayuvents.com or call +91 90961 88703. Share the building length, width, and height, the animal type and stocking density (for poultry) or crop type (for greenhouse), and the target temperature setpoint. We will calculate the required total airflow, fan count, layout, and inlet sizing and provide a commercial proposal within 24 hours.