Ductwork Installation Guide Pdf

Duct system design guide first edition 2003 mcgill airflow corporation mcgill airflow corporation one mission park groveport ohio 43125 duct system design i.

Ductwork installation guide pdf.

Checking the work œ quality control œ chapter 12. For best results and ease of installation store the clamps gaskets and caulk at between 50 and 80 f. Designers working alone are. 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.

X 2 20 ft. Contractors and specifiers who design and install duct systems although there is an abundance of published literature concerning mechanical. 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.

Larger volumes or higher static pressures should be dealt with on an individual job basis. 1 psi equals 27 7 inches of water gauge. X 1 40 ft. Shall be tested in accordance with sections.

X 1 3 ft. For installing in high ambient temperatures above 90 f consult aqc industries for special installation instructions. Leakage the time rate of air volume loss expressed in cubic feet per minute cfm l s. This equal friction method of duct sizing should be adequate for normal residential furnace heating and air conditioning applications.

Duct pieces equivalent length x number used equivalent length wall cap 40 ft. The following chart describes an example of one possible ductwork installation. Instructions install duct support system in leveled and squared curb. 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.

Ducts conforming to nfpa 90a or 90b shall meet the following requirements. 90 elbow 10 ft. 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. Ordinary heating ventilating and air conditioning duct systems read air pressures at 0 4 psi or less often much less.

A common duct pressure of 0 25 inches water column is equal to 0 25 divided by 27 7 in wc psi 0 009. Equivalent lengths of duct pieces are based on actual tests. 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. Ductwork is to be furnished by the contractor and is not included with the.

The following duct sizes are based on a fraction drop of 10 inches per 100 feet of lineal duct.