| Canada Blower Co. offers different types of | | | | * Welding Operations |
| Industrial Make-Up Air Systems for larger industrial | | | | * Chemical Exhaust |
| plants ventilation needs. | | | | * Degreasing |
| Negative Air Pressure in industrial manufacturing | | | | * Factory Ventilation |
| facilities can create problems such as: | | | | * Plastic Molding |
| - Exhaust fans losing performance, as the building | | | | * Foundry Works |
| pressure becomes negative. | | | | * Grinding & Buffing Operations |
| - Pilot light outages and exhaust system failure on | | | | Typical Commercial Uses: |
| natural draft gas equipment. | | | | * Warehouses |
| - Cold air drafts and infiltration of dirt and | | | | * Kitchens |
| contamination from outside. | | | | * Entryways |
| - Difficulty opening or closing exterior doors. | | | | * Gymnasiums |
| Nausea and headaches among personnel due to | | | | * Pools |
| inadequate ventilation. In temperate climates or during | | | | * Exposition Buildings |
| mild weather, moderate amounts of make-up air can | | | | * Garages |
| be supplied by simply opening windows or overhead | | | | Make-Up Air Volume Requirements: |
| doors. However, this is usually not the case in | | | | The recommended method for calculating Make-up |
| industrial and commercial facilities. Forced ventilation | | | | Air Volume is to determine the total CFM capacity of |
| Make-up air is required. | | | | exhaust fans, blowers, stacks, etc. in the building and |
| Direct Gas-Fired Make-up Air Units supply tempered | | | | add 10%. This will create a positive pressure in the |
| and filtered air to the indoor environment. In summer, | | | | building. |
| a direct-fired unit may be used as an air handler, with | | | | When information is not available, the following |
| the heater disabled. By adding a DX or evaporative | | | | estimates may be used to determine approximate |
| cooling section to the unit, it may be used to supply | | | | requirements: |
| conditioned air year round. | | | | - Paint / Spray Booth: 100 to 200 CFM per sq. ft. of |
| Make-Up Air Applications: | | | | face opening. |
| There are three general applications for Make-Up Air | | | | - Oven Exhaust: One air change per minute. |
| Units: | | | | - Fume Exhaust: Area of Pipe (in square feet) x |
| - Direct Compensating Ventilation | | | | velocity (3,000 feet/min average) = CFM. |
| - General Area Ventilation | | | | - Roof Ventilator: same as Fume Exhaust. |
| - Door Heating | | | | - Canopy Hoods: 100 to 300 CFM per square foot of |
| Direct Compensating Ventilation. | | | | hood open area. |
| Conditioned Air is Delivered to the Immediate Vicinity | | | | |
| of Exhaust. This is the case for welding fume | | | | - Furnace Combustion Air: Minimum CFM = BTU/hr |
| extractors, stovetop exhaust hoods, paint booths, or | | | | rating / 6,000. |
| similar applications. | | | | - Drying, Baking, Curing Ovens: 100 CFM per square |
| General Area Ventilation. | | | | foot of booth cross section. |
| | | | | - Pickling or Cleaning Tanks: 150 CFM per square foot |
| Conditioned Air Blankets Entire Area of Building to | | | | of door opening or 200 CFM per square foot of hood |
| Compensate for Many Exhausts. Introduced in | | | | face opening. |
| Cleanest Part of Building - Flows to Negative Pressure | | | | A Direct Gas-Fired Air Heating System may be used |
| Areas - Picks up Dust, Vapors, and Odors en route. | | | | in an industrial or commercial application for any or all |
| Door Heaters | | | | of the following purposes: |
| Heated Air is introduced at open doors to warm | | | | . Make-Up Air Heating - Air is introduced to a building |
| incoming air or compensate for loss. Heater may also | | | | to replace air being exhausted. |
| be used as part of an "air door" system. | | | | . Space Heating - A unit provides primary or |
| Typical Industrial Uses: | | | | supplementary heating to a building space. |
| * Plating Tanks | | | | . Space Pressure Control - Building or Room |
| * Paint Spray Booths | | | | Pressurization is held within a range. |