ASHRAE-90.1-2022- - Page 019
Extracted Content
fan system motor nameplate horsepower (hp): the sum of the motor nameplate horsepower of all fans that are required to operate at design conditions to supply air from the heating or cooling source to the condi- tioned spaces and return it to the source or exhaust it to the outdoors.
feeder conductors: the wires that connect the service equipment to the branch circuit breaker panels.
fenestration: an assembly, including the frame, in the building envelope that allows light to pass. Fenestra- tion assemblies include (but are not limited to) windows, plastic panels, clerestories, roof monitors, sky- lights, glass block, and doors where more than one-half of the door area is glazed. For the purposes of determining building envelope requirements, the classifications are defined as follows:
field-fabricated fenestration: fenestration whose frame is made at the construction site of materials that were not previously cut, or otherwise formed with the specific intention of being used to fabricate a fen- estration product or exterior glazed door . Field-fabricated fenestration does not include site -built fenes- tration designed to be glazed or assembled in the field using specific factory-cut or otherwise factoryformed framing and glazing units, such as storefront systems, curtain walls, and atrium roof systems. skylight: a fenestration surface having a slope of less than 60 degrees from the horizontal plane. Other fenestration, even if mounted on the roof of a building, is considered vertical fenestration . vertical fenestration: all fenestration other than skylights . Trombe wall assemblies, where glazing is installed within 12 in. of a mass wall, are considered walls, not fenestration.
fenestration area: total area of the fenestration measured using the rough opening and including the glazing, sash, and frame. For doors where the glazed vision area is less than 50% of the door area, the fenestration area is the glazed vision area. For all other doors, the fenestration area is the door area . (See door area .)
fixture: the component of a luminaire that houses the lamp or lamps or positions the lamp, shields it from view, and distributes the light. The fixture also provides for connection to the power supply, which may require the use of a ballast / driver .
floor: that lower portion of the building envelope, including opaque area and fenestration, that has conditioned or semiheated space above and is horizontal or tilted at an angle of less than 60 degrees from horizontal but excluding slab-on-grade floors . For the purposes of determining building envelope requirements, the classifications are defined as follows:
mass floor: a floor with a heat capacity that exceeds (a) 7 Btu/ft [2] ·°F or (b) 5 Btu/ft [2] ·°F, provided that the floor has a material unit mass not greater than 120 lb/ft [3] . steel-joist floor: a floor that (a) is not a mass floor and (b) has steel joist members supported by structural members. wood-framed and other floors: all other floor types, including wood-joist floors .
(See building envelope, fenestration, opaque, and slab-on-grade floor ) .
floor area, gross: the sum of the floor areas of the spaces within the building, including basements, mezzanine and intermediate-floored tiers, and penthouses with a headroom height of 7.5 ft or greater. It is measured from the exterior faces of walls or from the centerline of walls separating buildings, but excluding covered walkways, open roofed-over areas, porches and similar spaces, pipe trenches, exterior terraces or steps, chimneys, roof overhangs, and similar features.
gross conditioned floor area: the gross floor area of conditioned spaces . gross lighted floor area: the gross floor area of lighted spaces .
(See building envelope, floor, slab-on-grade floor, and space .)
flue damper: a device in the flue outlet or in the inlet of or upstream of the draft control device of an individual, automatically operated, fossil - fuel -fired appliance that is designed to automatically open the flue outlet during appliance operation and to automatically close the flue outlet when the appliance is in a standby condition.
fluid economizer: see economizer, fluid.
fuel: a material that may be used to produce heat or generate power by combustion.
fossil fuel: fuel derived from a hydrocarbon deposit, such as petroleum, coal, or natural gas derived from living matter of a previous geologic time.
functional performance testing (FPT): a systematic process to verify that controls and other elements of the building project are capable of and configured to operate or perform as required.
general lighting: see lighting, general .
ANSI/ASHRAE/IES Standard 90.1-2022 (I-P) 17