Greenheck has released two new online instructional videos for its line of direct gas-fired make-up air units that provide tempered air for a wide range of applications.

The video titled “Direct gas-fired make-up air pressure drop” details how to measure and adjust for pressure drop in a make-up air unit. “Direct gas-fired make-up air pre-start checks” reviews steps to be taken prior to making the unit operational.

Greenheck says its series of “How To” videos are designed to help contractors and facility managers handle common maintenance issues specific to HVAC equipment. To view these videos, visit and click on the Library link found on the home page navigation bar. Then click on videos.