1. Constant Volume Regulators

2. CVR Introduction Precision molded body UL-94V-0 rated material UL-2043
Soft pliable edge seal
Free area engineered both in size and shape
Aero-Gate floats up as airflow increases
Limits total flow over pressure range (0.2”wc to 0.8”wc)
No Power/ No Sensors – Just clever shapes
The Constant Volume Regulator is an ingenious duct insert. It has been designed to limit airflow through the duct. As the air flowing starts moving faster it causes the Aero-Gate rise to block more of the free area. Simple in concept, highly engineered in design. Now you have an pressure independent tool to deliver the “right” amount of air. These units have been in use in Europe for many years. They are being added to more and more job specs. It is easy to see why. They are relatively inexpensive and provide a tool to build comfort and realize energy savings at the same time.

3. Performance Data Choose your pipe diameter
Choose the required flow and the average static pressure
Plot your operating point
Draw the “best fit” line back to the scale on the left side of the graph.
Note your adjustment
Example 100 CFM 0.5”wc (X) Adjust the CVR to 170. X

4. Multi configurations All fittings are made from heavy 26-gauge steel
CVR-XX CVR-SXX/CVR-RXX CVR-RFXX/CVR-SFXX CVR-EXX/CVR-IXX
Regulator Regulator in a Regulator in a register box Regulator set in an
by itself register box deep enough to accept Intake/Exhaust Hood
a Fire/Radiation Damper
All fittings are made from heavy 26-gauge steel
Fittings designed to be as low-profile as possible
Custom fittings are our specialty
One stop Air Distribution shopping
As always Metal Made in America!

5. Applications
Any place you need to limit airflow, especially with variable pressure
Central Exhaust
Supply control
Retrofit Balance Control
Make-Up Air
Pressure Equalization
Demand Control Ventilation

6. Static Pressure (inWC)
Savings Potential
Case Study Limiting Exhaust to 62.1 requirements
Consider a 10-story condo block with a
central exhaust chase and a rooftop ventilator (in Boston, MA).
With an open 6” exhaust 0.1inwc, it will cost roughly $226 annually to condition the air required to replace the exhaust.
If, because of proximity to the fan, stack effect, and wind loads, the pressure at the top of the chase is 0.4inwc instead, then
Cost= $488. A CVR will save $262 annually!
Flow Rates and Costs - 6” Exhaust Vent
Static Pressure (inWC)
Uncontrolled Flow (CFM)
Annual Cost to Condition1 “New Air”
Annual Cost to Condition1
w/105 CFM CVR
Savings
0.8
330
$702
$226
$476
0.6
280
$604
$378
0.4
225
$488
$262
0.2
155
$338
$112
0.1
105 --
1 Cost figures from Paul Raymer, “Cost of Ventilation” Ventilation News and Views Aug 2013 ( Boston: HDD(55) =3299, Gas= $1.28/therm electricity=$0.18 kWh)

7. More Considerations IAQ Indoor Air Quality Variable Speed Motors
The CVR controls exhaust across all of the spaces.
Ensure that air changes happen!
If the motor changes speeds, pressure will change and therefore flow from the space will change
Not if you have CVRs installed!

8. Your Airflow Multi-Tool
Limit Airflow into or out of rooms
Independent of pressure
Ventilation
Make-up Air
Intake Control
Variable Speed Motors

9. Think Young!