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SMA CNA Technical Manuals and Standards Book Price List PLEASE CALL FOR MEMBER PRICING Prices Discounted List Description Accepted Industry Practice for Industrial Duct Construction, 1st Ed., 1975.
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PVC FAQ
Duct hanging and installation products for use in process ventilation / dust collection systems. Gripple Hanger. Gripple Hangers are the most common hanging method for QF® duct due to ease of use. ... Standard Pipe Hanger. ... Pipe Hanger HJ. ... Clamp Hanger. ... Strut Hanger. ... Wall Flashing. ... Roof Flashing. ... Roof Skirt.
Metal ducts shall be securely supported. Where hung or suspended, metal straps a minimum of 1 inch (25 mm) in width and equivalent to or heavier gage than the duct being supported shall be used. Straps, when used, shall be at maximum 64-inch (1626 mm) intervals and shall be securely attached to the building structure.
Hanger Spacing The often cited reference for hanger requirements is SMACNA HVAC Duct Construction Standards. Hanger spacing in SMACNA is either every 4', 5', 8' or 10'. Its best to use hanger spacing of 8' or 10' to maximize the span between hangers and reduce the amount of time for installing hangers.
Flexible duct shall be supported at manufacturer's recommended intervals, but at no greater distance than four feet. Maximum permissible sag is 1/2 inch per foot of spacing between supports. A connection to rigid ducting or equipment shall be considered a support joint.
For 4'-0” sections of rectangular duct, maintain a spacing of not more that 8'-0”. For 5'-0” sections of rectangular duct, maintain a spacing of not more than 10'-0”. For round duct maintain a spacing of not more than 12'-0”.
Thickness of sheet metal used in ductwork. CommentsSheet Metal GaugeSheet Thickness (inches)SMACNA1) Ductwork250.0218260.0187Not Suited for Ductwork270.0170280.015633 more rows
Round metallic ducts shall be mechanically fastened by means of not less than three sheet metal screws or rivets spaced equally around the joint.
SMACNA standards and manuals address all facets of the sheet metal and HVAC industry – including duct construction and installation, indoor air quality, energy recovery, roofing and architectural sheet metal, welding, and commissioning.
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