Orando metal duct repair replace
Introduction to rectangular Duct Construction schedules:
rectangular table reading guide 1. determine pressure class a signed by the designer 2. go to the reinforcement schedule for the duct pressure class 3. the greater duct Dimension determines the gauge for all sides , reinforcement may be different on sides with unequal dimensions 4. the duct side will either qualify for Flat Top joint connections because the ductwork gage is thick enough to control the function without needing enforcement Wall will require and Alphabet letter code reinforcement that will determine the width the wall thickness and the maximum spacing interval.
duct sides having a gauge listed in the second column do not require reinforcement these are summarized as flat top joints may be used at any spacing flat slips and drives must not be less than two gages lower than the Duct game 24 gauge which is 70 millimeters
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C. Fabrication and installation shall conform to manufacturer’s recommendations and to the requirements of the latest edition of North American Insulation Manufacturers Association Fibrous Glass Duct Liner Standard (hereinafter referred to as NAIMA FGDLS) or of Sheet Metal and Air Conditioning Contractors National Association HVAC Duct Construction Standards – Metal and Flexible (hereinafter referred to as SMACNA HVAC DCS).
B. Duct liner shall be adhered to the sheet metal with 90% (minimum) coverage of adhesive complying with requirements of ASTM C 916. C. If not already coated by the duct liner manufacturer, all transverse edges not receiving sheet metal nosing shall be coated. Longitudinal joints in duct liner should occur at the corners of ducts. If duct size and standard duct liner product dimensions may make exposed longitudinal joints necessary, exposed joints shall be coated with adhesive designed for duct liner application meeting requirements of ASTM C 916. Such joints shall be secured with mechanical fasteners in accordance with NAIMA FGDLS, treated as transverse joints. D. Duct liner shall be mechanically fastened with weld-secured or impact-driven fasteners so as to compress the insulation no more than 1/8 in. (3 mm) based on nominal insulation thickness, installed perpendicular to the duct surface. Spacing of mechanical fasteners with respect to interior duct dimensions shall be in accordance with NAIMA FGDLS or SMACNA HVAC DCS. Fastener heads or washers shall have a minimum area of 0.75 in.2 (5cm2) with beveled or cupped edges. E. Metal nosings (channel or zee) shall be securely installed over transverse liner edges facing the airstream at fan discharge and at any point where lined duct is preceded by unlined duct. Also, where air velocities exceed 4,000 fpm (20.3 m/sec), metal nosing shall be installed on upstream edges of all lined duct sections. F. Flexible duct liner shall be folded and compressed at corners of rectangular duct sections, or shall be cut and fit to assure a lapped, compressed corner joint. G. Rigid duct liner shall be cut and fit to assure tight, overlapped corner joints. Top pieces of rigid duct liner shall be supported at the edges by side pieces. H. Installation of two layers of duct liner is not recommended. If the specification forces the use of multiple layers, the following steps shall be taken: 1. First layer of duct liner shall be adhered to the sheet metal in the usual manner..
3.04 Commissioning After the lined duct system is completely installed and ready for service, a final inspection of the entire system shall be conducted. This inspection should include, at minimum, the following steps: 1. All registers, grilles, and diffusers shall be checked to ensure that they are clean and free from construction debris. 2. All filters shall be checked in accordance with their manufacturers’ instructions. Specified grade of filters shall be used at all times system is operating. 3. Supply openings shall be covered with filter media prior to system start-up to catch any loose material that may remain inside the ductwork. 4. The HVAC system shall be turned on and allowed to run until steady state operation is reached. 5. Temporary filter media shall be removed from supply openings and, along with it, any loose material blown downstream and caught by the filter media. 6. Air delivery performance shall be checked to ensure that it meets all requirements and complies with SMACNA leakage specifications. 3.05 Safety precautions A. All job site operations shall be conducted in compliance with applicable provisions of the Occupational Safety and Health Act, NAIMA’s Health and Safety Partnership Program (HSPP) and all state and/or local safety and health codes and regulations that may apply to the work. Consult manufacturer’s Material Safety Data Sheet (MSDS) when appropriate.