Furnace Air Intake Requirements

Hi efficient furnaces will still require them if drawing combustion air for the burner from inside the building other wise they would have a 2 pipe system.

Furnace air intake requirements.

46 of important installation criteria were in compliance with best practices 3 this represents a large gap between expected and actual furnace performance. Unfortunately the fresh air intake you have described is the second type and does not provide direct combustion air to the furnace room as it is directly connected to the return air plenum for the furnace. The pvc pipes are used for air intake exhaust gas and to remove the corrosive condensation resulting from the combustion process. Other aspects of high efficiency furnace venting.

In the case of residential applications though things are somewhat different. A gas furnaceneeds approximately thirty feet of air for every foot of gas used. This high efficiency venting system must be installed when you install the new furnace. This is a requirement by code for all mid efficient furnaces.

A recent study on furnace installation quality completed for fortisbc indicated that on average only. This fresh air will enter the air circulation system of the heating system which is separate from the combustion chamber on your furnace. There are several other important aspects of high efficiency furnace venting. Home furnace air intake location.

You want to see at least one sq. Since there is really no specific requirement that states the exact amount of fresh air necessary a rule of thumb which says that it s generally accepted that a person needs 15 cfm cubic feet of air per minute of fresh air applies. Square inches of combustion air intake. For heating equipment installed in confined spaces an old timer s rule of thumb is to add up the total input btuh numbers from all of the data tags on all of the heating equipment installed.

This is roughly the equivalent of running a bathroom exhaust fan into your furnace s combustion chamber. Furnace fresh air intake general discussion. The furnace lifespans specified by many manufacturers. Of open fresh air intake per 1000 btuh.

There are two types of airflow furnaces a downdraft or downflow furnace and an updraft or. The easy answer is oxygen is a key element in combustion therefore your furnace needs air.