- TESP is the measure of resistance the blower must overcome outside (external) to the air handler or furnace cabinet. (ductwork, coil, grilles, dampers, filters, etc...)
- Static probes should be positioned into the direction of airflow. The holes in the probes are perpendicular to the airflow.
- If individual readings are taken for TESP
- Add the two readings together for TESP
- 0.50” w.c. is usually the max TESP recommended by most manufacturers using multi speed blowers.
- Variable speed blowers can be slightly higher.
- Most manufacturers TESP numbers are based on a wet coil.
- A dry coil will have a lower TESP
- Static probes can be place on each side of a piece of equipment (coil, filter etc.) to get the pressure drop (resistance) across that specific piece of equipment.
- Subtract the low reading from the high reading when testing individual components for pressure drop.
- Always remember to read the notes on the bottom of the manufacturer’s blower performance table for specifics in testing their equipment.
Upflow Gas Furnace with a Return Drop
Downflow Gas Furnace
Horizontal Furnace
Horizontal Heat Pump or Air Handler
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