Residential HVAC Term Duct board
used in residential construction is a
foil backed dense fiberglass product.
It is normally one inch thick. The duct
board is cut and formed to create a
chase for supply air or return air. As
the duct is put together the joints are
taped with a foil back tape in order to
form an air tight duct. The duct board
supply duct forms the main supply
duct from which either flex or metal
smaller supply ducts are attached.
Residential HVAC Term
Combustion Air is the air
used to ignite a gas
furnace. As a safety factor,
a gas furnace needs a
separate source of air for
combustion air is provided
by a metal duct that is
installed in the furnace
closet and extends
through the ceiling into the
attic to furnish outside air.
Residential HVAC Term
Zoning refers to the
process of dividing a
house into zones for
cooling and heating
purposes. This type of
system can use control
dampers in the duct to
control air flow to the
individual zones. A
thermostat is installed in
each zone. When a zone
requires air, the unit will
come on and the damper
will open for that zone.
The excess air will be
diverted back through the
return air duct.
Residential HVAC Term Air Chase
refers to the duct that is used to carry
either supply air or return air to and
from the air handler.This can be
fiberglass duct board, insulated metal
duct, or large flex duct.
Residential HVAC Term Air Flow expresses the amount air that flows through an air duct per minute. The
air flow is measured and is expressed in cubic feet per minute (CFM).
Residential HVAC Term Freon is a type of refrigerant used in air conditioning
Residential HVAC Term BTU
stands for British Thermal Unit. This
is the amount of heat it takes to raise
or lower one pound of water one
Residential HVAC Term Attic Ventilator refers to a power vent install on the roof or in the gable end of a
house to remove hot air from the attic. These ventilators are thermostat controls and only run when the
temperature exceeds the setting.
Mechanical Term Seer stands for
Seasonal Energy Efficiency Rating.
Most cities and counties now require a
minimum of a 10 SEER rating. The
higher the rating the more efficient the
cooling unit will operate.
Category Construction Glossary