Ductwork Installation Guide Pdf

Ordinary heating ventilating and air conditioning duct systems read air pressures at 0 4 psi or less often much less.

Ductwork installation guide pdf.

Ductwork is to be furnished by the contractor and is not included with the. Equivalent lengths of duct pieces are based on actual tests. Larger volumes or higher static pressures should be dealt with on an individual job basis. Contractors and specifiers who design and install duct systems although there is an abundance of published literature concerning mechanical.

90 elbow 10 ft. Ducts conforming to nfpa 90a or 90b shall meet the following requirements. X 1 40 ft. Duct pieces equivalent length x number used equivalent length wall cap 40 ft.

Sheet metal duct lined with fibrous glass insulation duct liner secured to sheet metal with adhesives plus metal fasteners available in thicknesses from 1 2 to 2 in. The following duct sizes are based on a fraction drop of 10 inches per 100 feet of lineal duct. X 2 20 ft. Straight duct 3 x 10 rectangular 3 ft.

This equal friction method of duct sizing should be adequate for normal residential furnace heating and air conditioning applications. The following chart describes an example of one possible ductwork installation. A common duct pressure of 0 25 inches water column is equal to 0 25 divided by 27 7 in wc psi 0 009. For best results and ease of installation store the clamps gaskets and caulk at between 50 and 80 f.

Leakage the time rate of air volume loss expressed in cubic feet per minute cfm l s. For installing in high ambient temperatures above 90 f consult aqc industries for special installation instructions. Installation requirements 4 1 code reference the authority having jurisdiction should be referenced to determine what law ordinance or code shall apply in the use of flexible duct. 13 to 51mm tough airstream surface resists shop installation and service damage sheet metal ducts must be tightly sealed fibrous glass duct liners are manufactured to.

Listed a published list by a recognized approving. Site condition and preparation it is not prudent practice to install underground duct work where ground water is present. Fabricate ductwork with 1 fl ange out on top opening and with an outside dimension that is smaller than inside dimension of duct openings cre ated by duct support system. Installation instructions a manufacturers printed instructions in accordance with the terms of their listing which advises the method and materials to install the flexible duct.

1 psi equals 27 7 inches of water gauge. X 1 3 ft. Shall be tested in accordance with sections. Designers working alone are.

Instructions install duct support system in leveled and squared curb.