Справочник Пользователя для Radware VOYA-GRAND-PMH

Page  26

7075-166

September 25, 2012

R

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

•  Negative pressure can cause spillage of com-

bustion fumes, soot and carbon monoxide.

•  Appliance needs to draft properly for safety.