Terminology and Definitions
ACCA - correct answer ✔Air conditioning contractor association
ACH - correct answer ✔Air changes per hour
AFUE - correct answer ✔Annual Fuel Utilization Efficiency averaged over a
heating season. ( Does not include distibution losses)
Air Barrier - correct answer ✔the barrier that prevents infiltration of outdoor
air into the conditioned spance and exfiiltration of indoor air to thhe outside.
Also known as "Pressure boudary". ( It should be continuous and aligned with
the thermal boundary)
Air Changes at 50 Pascals (ACH50) - correct answer ✔The number of times
the volume of air is exchanged when a blower door depressurizes the home
Air Exchange - correct answer ✔The total building air exchanged with the
outdooes through air leakage and ventilation
Air Handler - correct answer ✔A vlower with cooling and/or heating coils
connected to ducts,housed in a steel cabinet
Audit - correct answer ✔A process used to identify energy savings
oppurtunutues in buildings
,Air sealing - correct answer ✔The process of sealing bypasses in the
pressure boundary to prevent air leakage. This reduces heat flow from air
movement and prevents water vapor from entering the building cavities
Asbestos - correct answer ✔Heat resistant material used previously in many
building products; represents serious health hazarf as an airborne particulate
ASHRAE - correct answer ✔.American Society of Heating,Refrigeration, and
Air Conditioning Engineers. (Professional societ of researchers and scientist
that set standards for heating,refrigeration, and ventilation
Atmospheric Venting System - correct answer ✔a standard chimnet or B
type vent that is intended to remove combusion byproducts. The pressure
inside vent should be negative with reference to (WRT) the room that houses
the the appliance
Attic Bypass - correct answer ✔an air passway between the living space and
the attic
Attic Ventilation - correct answer ✔ventilation intended to remove heat and
moisture from attic areas to the outside
Backdraft - correct answer ✔prolionged or continuous spillage of combustion
byproducts into the home
Balanced Mechanical Ventilation System - correct answer ✔a mechanical
ventiliation system with inlets and oulets that does not induce pressure
differences while operating the home
, Balance Heat Recovery Ventilator - correct answer ✔a balanced mechanical
ventilation system with incoming and outgoing air that recovers heat from one
air steam to the other without mixing the iar streams
Balloon Framing - correct answer ✔a construction method where the walls
are framed before the floor is built, and the wall cavity is often open to both
the attic and the basement
Band Joist - correct answer ✔the perimeter of the floor assembly that is
between the first and second floors of the structure
Barometric Damper - correct answer ✔a damper actuated by ar pressure
differentials
Base Pressure - correct answer ✔is the natural pressure difference between
the zone being tested and the outside(without any exhaust appliances running
and with the house in "winter condition")
Baseload - correct answer ✔the amounf of energy (electric and combustion
fuel) used to operate year-roud lighting and appliances
Blower Door - correct answer ✔a diagnostic tool used to test for house
leakage consisting of a fan, a removeable panel, and gauges
Bottom Plate - correct answer ✔the bottom horizontal wall framing
component
BPi - correct answer ✔Building Performance Institute