February 25, 2016 7062-196B 13Explorer INegative pressure results from the imbalance of air avail-able for the appliance to operate properly. It can be strongestin lower levels of the house.Causes include:• Exhaust fans (kitchen, bath, etc.)• Range hoods• Combustion air requirements for furnaces, water heatersand 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 leaksTo minimize the effects of negative air pressure:• Install the outside air kit with the intake facing prevailingwinds during the heating season• Ensure adequate outdoor air for all combustion appliancesand exhaust equipment• Ensure furnace and air conditioning return vents are notlocated in the immediate vicinity of the appliance• Avoid installing the appliance near doors, walkways orsmall 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 seamstaped or sealedWARNINGAsphyxiation Risk.• Negative pressure can cause spillage of combustionfumes, soot and carbon monoxide.• Appliance needs to draft properly for safety.K. Negative PressureL. Frequently Asked QuestionsISSUES SOLUTIONSOdor from appliance When first operated, this appliance may release an odor for the first several hours. This iscaused by the curing of the paint and the burning off of any oils remaining from manufacturing.Metallic noise Noise is caused by metal expanding and contracting as it heats up and cools down, similar tothe sound produced by a furnace or heating duct. This noise does not affect the operation orlongevity of the appliance.Whirring sound If the optional blower has been installed, the blower produces a whirring sound whichincreases in volume as the speed is increased.