Chris Mohalley Archives - HVAC School

Chris Mohalley

Company name: Regal Rexnord

Position: Training Manager

Chris Mohalley is the training manager at Regal Rexnord. He has written for ACHR News and tends to center his training on blower motors, especially ECMs. Chris is a veteran speaker at the HVACR Training Symposium and has also appeared on several HVAC School podcast episodes about blower motors and airflow performance.

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Real training for HVAC ( Heating, Ventilation, Air Conditioning and Refrigeration) Technicians. Including recorded tech training, interviews, diagnostics and general conversations about the trade.

Licensed mechanical engineer Tony Amadio joins the podcast to talk about residential exhaust codes and best practices. He also put together a presentation about the topic, which you can view at https://hvacrschool.com/exhaust.

When choosing duct materials for residential exhaust, you will want to stick to sheet metal and mind the gauge; flex ductwork can easily be damaged and will rack up a high total equivalent length in a way that sheet metal will not.

Exhaust air should always discharge outdoors, not into an attic or crawl space, and that air needs to be replaced by air entering the conditioned space; makeup air is the air we draw in to replace the exhausted air, and we need appropriate undercuts to make sure we’re getting the right amount of makeup air.

Domestic cooking exhaust may also come in a few different varieties, each of which has different code requirements (with downdrafts needing much more CFM per ASHRAE). Range hood shape is also important for capturing as many particles as possible, but makeup air kits are usually unnecessary (and could be more of a hassle than they’re worth).

When it comes to bathroom exhaust, the CFM requirements differ between residential and light commercial, as well as intermittent and continuous exhaust. Steam generators may also be present, and they require extra consideration.

Tony and Bryan also cover:

Tony’s education and career background
Discharging and terminating exhaust air
Insect screens
Makeup air in light commercial applications
Clothing dryer vs. bathroom vents
Ductless clothes dryers and condensate piping
Home Ventilation Institute (HVI) guidelines
Pressure imbalance in a structure
Residential vs. light commercial bathroom exhaust
Static pressure, blower sizing, and exhaust duct sizing

You can ask Tony questions by email at anthony.amadio@peloadcalcs.com.

Learn more about the 5th Annual HVACR Training Symposium at https://hvacrschool.com/Symposium24.

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Residential Exhaust Codes and Best Practices

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Residential Exhaust Codes and Best Practices

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ACH (Air Changes Per Hour) – Short #174

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Oil Return and Refrigerant Charge in VRV w/ Roman Baugh

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Magical Air Cleaning Oxides? – Short #173

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Can Filters Capture Viruses? – Short #172

08/22/2023

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Heat Pumps + Inverters w/ Joey H

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Nylog Blue Gasket -Thread Sealant for AC/R Systems
One drop of Nylog on your rubber hose gaskets prior to attaching your core tools, hoses or vacuum gauge will assure that things do not bind or leak during evacuation. Derived from refrigeration grade lubricants. Non-hardening, non-drying fluid which bonds tenaciously to many different substrates. Typically, one drop of Nylog can be stretched about three feet before breaking.

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