Duct blaster

Duct blaster

Calibrated air-flow measurement system developed to test the air-tightness of forced-air duct systems. All outlets for the duct system, except for the one attached to the duct blaster, are sealed off, and the system is either pressurized or depressurized; the work needed by the fan to maintain a given pressure difference provides a measure of duct leakage.
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Professionals then perform duct blaster and blower door tests, energy modeling and process the documentation to obtain energy discounts for new homeowners after the home is complete.
Gary came up with the duct blaster and an affordable digital manometer.
Once construction is complete, a blower door test and a duct blaster test are performed, among other inspections, to insure the home exceeds ENERGY STAR[R] standards.
Airflow and duct leakage tests were conducted using an Energy Conservatory Duct Blaster and Model 3 Blower Door in accordance with ANSI/ASHRAE Standard 152 (ASHRAE 2004c).
Estimates of supply duct leakage were assessed at each collected data point by correcting for changes in the observed supply plenum operating pressure and using a power-law flow-leakage approximation following the procedures in the Duct Blaster manual and ANSI/ASHRAE Standard 152-2004, as shown in Equation 4 (ASHRAE 2004c; The Energy Conservatory 2007).
The blower door, duct blaster, manometer, and infrared camera are the backbone of the rating system.
The home tour, which will include blower door and duct blaster tests as well as an explanation of ENERGY STAR upgrades, is open to the press and will be immediately followed by a press conference.
Then, we cut a couple of holes in the interior walls up near the top at the underside of the roof, and used duct tape to hold a duct blaster in place and figure out how much air needed to be added to pressurize the parapet to prevent air from migrating from the wall assembly into the roof assembly (Photo 11).
But, Gary Nelson hadn't invented the duct blaster yet, and a blower door would have been too big.
Duct leakage was measured using an Energy Conservatory Duct Blaster (uncertainty [+ or -]3% of flow reading) and Model 3 blower door in accordance with ASHRAE Standard 152-2004.