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McGill Leak Detective® Test Kits:

Standard Test Kits
Cart Assembly
Orifice Tubes
Smoke Delivery System
Choosing a Test Kit
Calibration Services

Leak Detective Test Kit Tools:
1. Determine Proper Kit
2. Calculate Allowable Leakage by Leakage Class
3. What Can Your Kit Measure?
4. Calculate Extension Cord Wire Gauge for Leak Detective Fans

Determine which Leak Detective Test Kit
fits your needs.
Enter the required system test pressure and allowable leakage. Click the Determine Proper Kit button to see which McGill test kit you should purchase. Calculations are based on the figures below.
Enter system test pressure:
in wg
Enter max. allowable leakage:

Calculation assumes no inline loss. To include inline loss, add it to system test pressure above.

4- and 5-inch tube capacities

4- and 5-inch tube capacities

6- and 8-inch tube capacities

6- and 8-inch tube capacities

Calculate allowable leakage based on leakage class.

Enter the total surface area of the duct system to test. Pick the specified leakage class and test pressure.

Click the Calculate Allowable Leakage button to see what cfm leakage you must measure based on the input data.

Duct system surface area:
sq ft
Leakage class:
Test Pressure:
in wg
Allowable Leakage (cfm):
Recommended McGill Leak Detective Test Kit:
Calculations based on formulas given in SMACNA's HVAC Air Duct Leakage Test Manual, 1st edition, 1985 (5th printing 1993).
Find out what your Leak Detective Test Kit can measure.

Select your McGill Leak Detective test kit, then pick the nearest duct system test pressure—the pressure at which you are required to test. Select the options for length of flex duct and number of bends that best match the configuration from your test-rig to the duct system.

Click the Calculate Maximum Leakage button to see what cfm your kit can measure.

Choose your kit:
System test pressure:
in wg
Feet of flex duct:
Number of bends:
Maximum Leakage (cfm) your kit can measure:
Actual results will vary depending on the condition and the actual capacity of your tube and fan, and actual in-line losses. Calculations for inline losses assume an in-duct velocity of 2000fpm. An easy way of increasing the capacity of your kit is to use smooth duct and no elbows; the less flex duct the better.

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