Mechanical Systems/HVAC

Heating, ventilation, and air-conditioning (HVAC) comprise the “engine” that drives the comfort systems in most structures. They directly consume the largest portion of energy in buildings—which makes them critically important from an environmental standpoint. Additionally, good indoor air quality, to a significant extent, depends on the ventilation they provide, while a problematic mechanical system can create and distribute indoor pollutants.

The first place to look to minimize the impact of a mechanical system isn’t the equipment, however; it’s the building’s design and construction. Careful, integrated design and optimal levels of insulation can minimize the need for supplemental heating, ventilation, or air conditioning. In situations where a central mechanical system is still necessary, an efficient building envelope can reduce the size of that system. A high-performance domestic water heater is fully capable of supplying heat to a very well-insulated house in most U.S. climates.


Products in Mechanical Systems/HVAC

A. O. Smith Water Products Co.
A. O. Smith Water Products Co.
Intertape Polymer Group
Advanced Climate Technologies - ACT
Inova Products, Inc.
Aero Pure LLC
Aerocool Pro Series Evaporative Coolers
Phoenix Manufacturing, Inc
Aeroseal, LLC
York International Corp.
Air-King, Ltd.
Air-King, Ltd.
Tamarack Technologies, Inc.


Jan 9, 2017 10:17 AM ET

Recommendation on motorized dampers
by Charlie Sullivan

Most motorized dampers energize a motor, and keep it energized, to move the damper to one position, and then de-energize the motor and use a spring to return it to the default position. Thus, the motor must be one continuously to hold it in the non-default position. To avoid wasting electricity, it's best to only energize the motor occasionally, and usually have it in the default position. For an occasionally used vent fan, a "normally closed" damper is better than a "normally open" damper. That's also easier to wire to operate in conjunction with the fan.

I wouldn't bother with the time delay. Running the fan for 10 seconds without the damper open won't hurt the fan and won't burst the duct.

Jan 9, 2017 8:45 AM ET

Response to Eric Birenbaum
by Martin Holladay

The easiest way to achieve your goal is with a motorized damper in the duct. Google "motorized damper" and you'll find lots of models from several manufacturers.

An electrician should be able to wire it to operate with a time delay -- perhaps using the type of control sold for bathroom exhaust fans (many of which have an adjustable time delay feature).

Jan 8, 2017 7:19 PM ET

exhaust fans outdoor vent covers
by eric birenbaum

Does anyone make an exhaust fan vent cover that is more than just a simple flap that opens when the fan comes on. I thinking of something computer controlled delay so when the fan is switched on the insulated flap is motor driven to open and then the fan comes on/ Same with closing, fan off, delay till airflow stops and then cover closes tightly.

Sep 4, 2009 11:27 PM ET

Improving AirFlow - Saving Energy
by Energy Pro

We've tried the FlexRight product - (shapes flexible duct into 90-degree elbows and removes kinks that restrict airflow) - they work great for new or retrofit flexible duct installations. We use them in residential and commercial applications. Two thumbs up!