Hvac Air Duct Leakage Manual by SMACNA

By SMACNA

This American nationwide usual, ANSI/SMACNA 016-2012, covers revised leakage standards and builds at the confirmed tools for checking out ductwork for air leaks from the 1st version. comprises updates to the predicted leakage premiums for ductwork built to the SMACNA HVAC Duct development Standards-Metal & versatile, duct leakage try systems, tips about use of leakage trying out, different types of try equipment and try out setup and pattern leakage research. incorporates a new academic bankruptcy for designers and specifiers, to assist within the specification and implementation of duct leakage and trying out equipment.

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By SMACNA

This American nationwide usual, ANSI/SMACNA 016-2012, covers revised leakage standards and builds at the confirmed tools for checking out ductwork for air leaks from the 1st version. comprises updates to the predicted leakage premiums for ductwork built to the SMACNA HVAC Duct development Standards-Metal & versatile, duct leakage try systems, tips about use of leakage trying out, different types of try equipment and try out setup and pattern leakage research. incorporates a new academic bankruptcy for designers and specifiers, to assist within the specification and implementation of duct leakage and trying out equipment.

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1 I COMMENTARY FLOW EOUATION ON FLOW CALCULATION DERIVATION where º K º D 6P= º The basic tlow equation is = A V for whieh is in cfm, A is in ft2 and V is in fpm. 17 Iblft-sec/sec. To use basic formula in inches of water gage pressure it is neeessary to multiply the velocity head in feet by 12 inift and by .... 3 Ib/ft 3' To use velocity in fpm divide by 3600 s2/m2. 7 jh/p When p air volume. cfm eoeffieient of air tlow orifiee diameter. inehes The coefficient K is affeeted by the Reynolds number, a dimensionless value expressing flow eonditions in a duct.

Enter the fan cfm (Q), the tesl pressure (PT), and the leakage c1ass (CL> specitied by the designer. c. Enter an identification [or each duct segment to be tested. Compute and enter the eorresponding area of duct surfan; arca excluding any equipment connected in-line. d. Look up the alIowable Ieakage factor (F) from Figure 4-1 or Appendix E. Enter this number on the report for each test segment. 65). e. Calculate the allowable leakage for each test segment by multiplying thc surface arca by the leakage factor, then dividing by 100.

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