Heavy Duty Exhaust Fans
How To Install
Exhaust Fan-The Way To Install
The positioning of Exhaust Fans is an important factor in ventilation. Wrong positioning will make installation meaningless. Fans should be installed away from the air – paths or inlets as far as possible, enabling them to draw out polluted air and draw in fresh air quickly. Fans should be placed high on the wall – opposite to the air – inlets, for being polluted, the warm air starts rising. Placing them near doors or windows will cause air movement to be short circulated between the fans and adjacent inlets – keeping part of the room unventilated (see illustration above). It is preferable to use a combination of small and medium-sized fans than one large fan.
Diaphragm Mounted Fans
COOLAIRExhaust Fans can be supplied with special mounting arms (but without rings) to function against resistance. This helps the radial flow from the wingtips – reducing backflow losses and increasing pressure development. The ring mounted fans give maximum volume under free airflow conditions while the diaphragm mounted fans give maximum volume under free airflow conditions while the diaphragm mounted fans work against resistance.
Protection From Exposure
Fans, exposed to weather, are subject to moisture and dust-laden atmosphere– necessitating special protective treatment. As required, COOLAIR Exhaust Fans can be coated with epoxy paint or chlorinated rubber paint for protection against corrosive atmosphere. While working in moisture – laden atmosphere, the motor winding may absorb water causing damage to motor insulation. The Fans can provide special impregnation of motor windings, protection against ingress of water and guarantee protection against ingress of water and guarantee the protection of all interior and exterior surfaces.
Accessories
Wire Guard: Protection For Impeller
The motor and impeller sides of COOLAIR Exhaust Fans may be provided with strong wire guards. Motor side guard fits over mounting arms while impeller side guard fits into the orifice in the fan ring or diaphragm.
Louvre Shutters
These are made of aluminium, fitted into a steel frame with four fixing lugs. They are opened by fan draught and closed by gravity when the fans are switched off.
Wall Cowls
They provide an effective protection for fan outlets in exposed position. They protect the fans from weather and prevent opposing winds to restrict fan output. Reduction in delivery of free air due to fixing flanges. They are strong and coated with anti – rust paint.
Range
COOLAIR Exhaust Fan has the widest range to cover and suit your requirement from 230 mm (9″) to 900 mm (36″) in both single and three phases.
Packing
Fans, of all sizes, are packed in cartons – Fan Motor in one, Impeller Fitment in the other. Instructions regarding installation of electrical connection are given with each fan.
Air Change
COOLAIR Exhaust Fans Play A vital Role In…
Factory
Ventilation in a factory is a delicate problem. Serious air pollution from excessive heat, smoke and dust affects the general health, overall efficiency and output in a factory. COOLAIR Exhaust Fans will solve this problem.
Auditorium
Many badly planned public auditoriums become hot and stuffy immediately after their doors are closed and the show begins . Ceiling fans or air circulators cannot ease this situation except Exhaust Fans.
Cafeteria
Most cafeterias lack proper ventilation–cooking odorsand steamy – muggy air float constantly. It is desirable that COOLAIR Exhaust Fans should be fitted here to enable people to eat their food at ease.
Bank
Although banks in metropolitan cities are betterventilated, it’s not so in towns and villages . The hectic working pattern in banks require hygienic and comfortable working condition – ensured only by Exhaust Fans.
Library
A library room should be airy and damp – proof as possible both for the health and hygiene of library users and thousands of books stored therein. COOLAIR Exhaust Fans protect it from moisture, pollution and contamination.
Kitchen/Bathroom
Our kitchen and toilet are often gloomy and stuffy with insufficient air inlets. They need minimum 10 to 20 air changes per hour. COOLAIR Mini Exhaust Fans eliminate malodor and stuffiness.
Other Uses
Besides general ventilation, COOLAIR Exhaust Fans are widely used in Room Coolers – the most effective and economical device used in dry and low humid climates to keep houses and working places cool and comfortable. The 450 mm (18″) single phase 720 r.p.m. and 920 r.p.m. fans are ideal for domestic purpose and 600 mm (24″) 720 r.p.m. and 920 r.p.m. for large Room Coolers in cinema halls, restaurants, etc. Simple enough, one can make such a cooling unit at home at a very low cost.
Air Change-The Sole Solution
Air change is thus the most vital factor for an environment. Varying from location to location, it depends upon the surrounding, the number of people working and also the nature of work. A bank or an office requires much less air changes than a foundry or a boiler house. The table shown is a general guide. To determine the number of Exhaust Fans required, multiply the cubical content of room (length x width x height) in metre or feet by the number of air changes required and divide the result by air delivery of fan (see table).
| Location | Air-Changes Per Hour |
| Assembly Halls | 8-12 |
| Bakeries | 10-30 |
| Banks | 6-10 |
| Banquet Halls | 12-20 |
| Cafes / Restaurants | 15-20 |
| Canteens | 15-25 |
| Club Rooms | 8-12 |
| Factories | 10-20 |
| Garages | 8-20 |
| Hospitals | 8-12 |
| Hotel Bars | 12-20 |
| Kitchen (domestic) | 10-20 |
| Kitchen (commercial) | 20-30 |
| Laboratories | 10-15 |
| Lavatories | 15-20 |
| Offices | 8-12 |
| Paint Shops | 30-50 |