| Using A Duct Blaster: | | | | Blower doors help in energy conservation and ensure |
| Duct blasters measure the exact amount of air | | | | air quality. A blower door should be set up on the |
| leakage in a duct system. There are two types of | | | | main door of the house and must be shielded from |
| duct systems. Metal ducts are rigid and installed with | | | | the wind. It can be installed by following below simple |
| the help of a metal strip. You need to cut the joists | | | | steps. |
| in which ducts are installed. This strip is wrapped | | | | - The blower door frame should be expanded. Fit in |
| around the ducts. It is then coiled into the joists. | | | | into door jamb and tighten the knobs. Remove the |
| Elbow joints help rigid ducts change their direction at | | | | door frame and attach nylon cover. Connect the |
| right angle. Flexible ducts are round tubing. They have | | | | exterior house pressure hose in the opposite |
| a layer of insulation. It is flexible enough to bend | | | | direction of the fan flow. Then install door frame in |
| around a corner. | | | | the door jamb and lock it into the jamb. |
| A duct blaster consists of a calibrated fan which can | | | | - Install fan in a depressurizing direction. It should be |
| blow up to 1500 cubic feet/ minute of air. It has a | | | | inserted into the elastic seal around the door's cover |
| pressure tap along with a flexible ducting to hook-up | | | | hole. Set up gauges by attaching the gauge clamp to |
| with a duct system. Duct Blasters can be installed by | | | | the door jamb. Attach gauges to the gauge clamp. |
| following below simple steps. | | | | Connect pressure tubing to the gauges. |
| - Connect the duct blaster to the duct system at air | | | | - Now connect interior house pressure hose between |
| handler or a central return grille. | | | | the nylon door panel and the house pressure gauge. |
| - Seal all other entry points. | | | | Make sure the exterior pressure hose is not exposed |
| - Turn on the fan. Increase the flow until duct | | | | to the fan flow. |
| system is pressurized to specified test pressure. | | | | - Plug in all the electrical plugging. Bring the pressure |
| - Use airflow and pressure gauge to measure the | | | | gauges to zero. Turn on the fan. Run power up a |
| leakage rate. You can inject theatrical fog into duct | | | | few times until gauges come to a steady zero. |
| system. This will locate the leakage spots. The duct | | | | Blower door will calculate the air tightness in the form |
| blaster precisely measures leakiness from 20-1500 | | | | of air flow and leakage area. Determining air tightness |
| CFM. | | | | of a building is important to increase energy |
| Installing A Blower Door: | | | | conservation and decrease indoor pollution. |