2700-I ACC Wood Insert

C. Negative Pressure

WARNING

Asphyxiation Risk.

Negative pressure can cause spillage of com- bustion fumes, soot and carbon monoxide.

Appliance needs to draft properly for safety.

Negative pressure results from the imbalance of air available for the appliance to operate properly. It can be strongest in lower levels of the house.

Causes include:

Exhaust fans (kitchen, bath, etc.)

Range hoods

Combustion air requirements for furnaces, water heaters and other combustion appliances

Clothes dryers

Location of return-air vents to furnace or air conditioning

Imbalances of the HVAC air handling system

Upper level air leaks such as:

-Recessed lighting

-Attic hatch

-Duct leaks

To minimize the effects of negative air pressure:

Install the outside air kit with the intake facing prevailing winds during the heating season

Ensure adequate outdoor air for all combustion appliances and exhaust equipment

Ensure furnace and air conditioning return vents are not located in the immediate vicinity of the appliance

Avoid installing the appliance near doors, walkways or small isolated spaces

Recessed lighting should be a “sealed can” design

Attic hatches weather stripped or sealed

Attic mounted duct work and air handler joints and seams taped or sealed

Basement installations should be avoided

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7046-137C

December 15, 2009

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Quadra-Fire 7046-137C warranty ACC Wood Insert Negative Pressure