Forced Warm-Air Heating from Ching Visual Dictionary of Architecture

Forced Warm-Air Heating from Ching Visual Dictionary of Architecture

Forced Warm-Air Heating = a system of heating a building by means of air heated in a furnace and distributed bya a fan through ductwork to registers or diffusers

extended plenum system = A perimeter heating system in which a main duct conveys warm air to a number of branch ducts, each serving a single floor register.

Bonnet = A chamber at the top of a hot air furnace from which the leaders emerge. also called plenum.

Leader = a duct for conveying warm air from a furnace to a stack or branch duct. Also called main, trunk.

Manifold = a pipe or duct fitting having several outlets for making multiple connections.

gathering = a tapered section of a duct or flue forming a transition between two sections, one of which has a greater area than the other.

boot = a duct fitting forming a transition between two sections which vary in cross sectional shape.

duct = a pipe or conduit of sheet metal or fiberglass for conducting heated or conditioned air. also called air duct.

ductwork = a system of ducts, connectors, and dampers for conveying air in a heating, ventilating or air conditioning system. also called ducting.

stack = a vertical duct for conveying warm air from a leader to a register on an upper floor.

chase = a continuous space or recess built into a wall or through a floor for pipes or ducts.

grille = a grating or perforated screen for covering, concealing, or protecting a wall, floor or ceiling opening.

register = a device for controlling the flow of warm or conditioned air from an outlet, composed of a grill with a number of parallel blades that may be adjusted so as to overlap and close the opening.

perimeter heating = a heating system that distributes warm air to registers placed in or near the floor along exterior walls.

perimeter loop system = a perimeter heating system in which a loop of ductwork, usually embedded in a concrete ground slab, distributes warm air to each floor register.

perimeter radial system = a perimeter heating system in which a leader from a centrally located furnace carries warm air directly to each floor register.

flexible duct = a pliable, airtight fitting installed between two ducts, or between a fan and a duct, to prevent the transmission of noise and vibrations along the ductwork.

duct liner = a fiberglass blanket for lining the inside of a duct to reduce noise and serve as thermal insulation.

diffuser = a device having slats at different angles for deflection warm or conditioned air from an outlet in various directions.

throw = the distance a projected airstream travels from an outlet to a point where its velocity is reduced to a specified value.

terminal velocity = the average velocity of a projected airstream at the end of the throw.

drop = the vertical distance a horizontally projected airstream falls from the elevation of its outlet, measure at the end of the throw.

spread = the extent to which a projected airstream diffuses at the end of the throw.