Combustion Air Fan Gas Furnace

This is roughly the equivalent of running a bathroom exhaust fan into your furnace s combustion chamber.

Combustion air fan gas furnace.

All gas fired appliances must have both a flue chimney to exhaust the leftover products of combustion outlet as well as combustion air to provide the oxygen for burning inlet. Direct vented combustion appliances are designed and tested to burn fuel and draw combustion air properly even when high winds hinder draft. Enter the input ratings of all appliances in table 1. In high efficiency furnaces the combustion air is generally piped in directly from the outside straight into the combustion chamber.

A gas furnaceneeds approximately thirty feet of air for every foot of gas used. Some heating appliances furnaces boilers and water heaters are designed to isolate the combustion process from the living space entirely avoiding the need for complex combustion air and venting schemes. Sizing combustion air openings step 1. It may also be used with millivolt water heaters and more than one appliance.

If a gas fired furnace is located in an open area basement or utility room and the ventilation is relatively unrestricted there should be a sufficient supply of air for combustion and draft hood dilution. Total the column. If you do not have the ability to do these operations safely do not attempt them. Proceed to either part a part b or part c.

The furnace is now a closed loop system pulling air from the outside and then sending it back out with the combustion gases. This creates a dedicated source of oxygen and also a cleaner install as no other provisions need to be make for combustion air. Field controls cas 6 fan in a drum combustion air system up to 900 000 btu this product is designed for use with any oil or gas fi red furnace water heater or boiler with 24 vac or 120 vac control systems. To properly size the combustion air openings add the input of all fuel burning equipment inside the boiler room.

Gas furnace inducer or combustion blower problems when troubleshooting understand you are working with potentially lethal voltages and a highly flammable gas. Of area for each 1 000 btu hr. These small air combustion fans or blowers are in addition to the large indoor blower on the furnace. The easy answer is oxygen is a key element in combustion therefore your furnace needs air.

One cfm of air for each 2 400 btu hr.