Constant Volume Regulators

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

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

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

Multi configurations

• 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!

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

Savings Potential

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 $4760.6 280 $604 $226 $3780.4 225 $488 $226 $2620.2 155 $338 $226 $1120.1 105 $226 $226 --

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)

Case StudyLimiting 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 duct @ 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, thenCost= $488. A CVR will save $262 annually!

More ConsiderationsIAQ 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!

Your Airflow Multi-Tool

• Limit Airflow into or out of rooms

• Independent of pressure

• Ventilation• Make-up Air• Intake Control• Variable Speed Motors

Think Young!