F Definitions

Definition Categories

Fan + Fan

The Fan + Fan column in the tables lists the maximum combined input capacity, in Btu/ hour, of two or more Category I fan-assisted gas appliances connected to a common vent.

Fan + Nat

The Fan + Nat column in the tables lists the maximum combined input capacity, in Btu/hour, of one or more Category I fan-assisted gas appliances and one or more draft hood appliances connected to a common vent.

Fan Max

The Fan Max column in the tables lists the maximum input capacity, in Btu/hour, of one fan-assisted gas appliance connected directly a vent or to a vent connector. Example: the maximum Btu/hour input capacity of a Category I fan-assisted furnace connected to a 4 inches diameter single wall vent connector with a vent height of 10 feet and a lateral length of 5 feet is 111,000 Btu/hour. See Table G2428.2-2.

Fan Min

The Fan Min column in the tables lists the minimum input capacity, in Btu/hour, of one fan-assisted Category I gas appliance connected directly a vent or to a vent connector. Example: the minimum Btu/hour input capacity of a Category I fan-assisted furnace connected to a 4 inches diameter Type B vent connector with a vent height of 10 feet and a lateral length of 5 feet is 32,000 Btu/hour. See Table G2428.2-1.

Feeder

A feeder circuit consists of all wires that run between a voltage source and the final circuit breakers or fuses protecting branch circuits. In residential electrical systems, feeders may run between the service equipment and the main panelboard and between the main panelboard and any subpanels.

Fenestration

Fenestration means any door, window, glass block, or skylight whether glazed or opaque.

Fire suppression (sprinkler) system

A fire suppression system (usually called a fi re sprinkler system) is a system of pipes and spray heads that automatically activate during a fire to suppress the fire with water or chemicals. See Section P2904.

Firebox or combustion chamber

The firebox is the area in the fi replace where the fuel is burned. Firebox opening The firebox opening is at the widest and highest dimension at the front of the firebox. The firebox opening extends vertically from the top of the hearth to the bottom of the lintel and horizontally across the front of the firebox walls.

Fireplace

A fireplace consists of a firebox and a chimney intended for burning solid fuels. Fireplaces may be site-built masonry or factory-made systems. “Fireplaces” built to burn only gas are not fireplaces; they are gas appliances

Fittings (plumbing)

A fitting is a device that connects parts of the plumbing system together and that allows pipes to change direction. Drainage fittings include wyes, bends, tees, and couplings. Water supply fittings include elbows, tees, couplings, and valves.

Fixture (plumbing)

A fixture is a device that connects to water supply pipes and connects to plumbing waste pipes. Fixtures include toilets (water closets), bathroom sinks (lavatories), kitchen and laundry sinks, bathtubs, and showers.

Fixture drain

A fixture drain is the pipe between a trap outlet and the fitting connecting it to another drain pipe. A fixture drain is sometimes called a trap arm because in many cases the connection to another drain pipe is also the connection to the vent protecting the trap. See trap arm.

Flashing

Flashing is a material that does not allow water to pass and is placed at joints and openings to prevent water entry into a building. Flashing may be sheet metal, rubber, plastic, or roll roofing material. Caulk, roofing tar, and mastic are sealants, and are not flashing.

Footing (spread)

A spread footing is a rectangular concrete base that usually supports basement and crawl space foundation walls. It is usually installed first, then foundation walls are installed on the footing in a separate process. Contrast with a monolithic slab footing in which the footing and concrete foundation slab are poured in one process.

Fountain

A fountain is an ornamental water feature including ornamental ponds and reflecting pools. Fountains more than (>) 18 inches deep may be subject to pool barrier and access requirements.