Whole-Building Ventilation Examples

Assumptions Key to Costs
1500 sq ft house
2 bedrooms
1 bathroom
37.5 cfm whole-building ventilation rate
$ = < $300
$$ = $301 - 600
$$$ = $601 - 900
$$$$ = $901 - 1,200
$$$$$ = $1,200 - 2,000
$$$$$$ = > $2,000
Notes

Click system name to view system drawing.


Cost = incremental costs above local exhaust equipment & installation


Energy = estimated annual energy use in kWh/year


Fan = fan efficacy in cfm/watt for designed air flow
Ventilation operating cost for fan energy only. Does not take climate information into account. Cost of conditioning outdoor ventilation air varies with outdoor temperature.


Maintenance = annual maintenance required

Exhaust-Only Systems
Name / Description Cost Energy
(kWh/year)
Fan
(cfm/watt)
Maintenance

E1: Single Point Exhaust-Only System
One fan exhausts stale air from one location. Wall vents or air leakage through the building envelope provide make-up air.

$ – $$ 35 – 438 1 to 15 Clean 1 fan grille

E2: Two Point Exhaust-Only System
Two fans (or one inline fan with two pickups) exhaust stale air. Wall vents or air leakage through the building envelope provide make-up air.

$ – $$$ 70 – 701 1 to 15 Clean 2 fan grilles

E3: Multiple Point Exhaust-Only System
Multiple fans (or a multi-port fan ducted to several rooms) exhaust stale air. Wall vents or air leakage through the building envelope provide make-up air.

$$ – $$$$ 70 – 876 1 to 15 Clean 3 or more exhaust grilles

Supply-Only Systems
Name / Description Cost Energy
(kWh/year)
Fan
(cfm/watt)
Maintenance

S1: Single Point Supply-Only System
One fan supplies outdoor air to the home at one location. Stale indoor air moves outside through local exhaust ducts and air leakage through the building envelope.

$ – $$$ 53 – 876 1 to 5 Clean 1 supply grille and filter and 1 exterior intake grille

S2: Central Fan Integrated (CFI) System
The air handler fan in the HVAC system pulls air into the return side of the air handler and distributes it to the home through the HVAC ducts.

$$ – $$$ 730 – 1,460 0.5 to 2 Clean multiple supply registers, air handler filter, and 1 exterior intake grille

S3: Multi-Fan Supply-Only
Two or more fans supply outdoor air to the home in several locations. Stale indoor air moves outside through local exhaust ducts and air leakage through the building envelope.

$$ – $$$ 105 – 1,314 1 to 5 Clean 2 or more supply grilles, filters, and exterior intake grilles

S4: Multiport Fan Supply-Only
A multiport fan supplies outdoor air to the home in several places. Stale indoor air moves outside through local exhaust ducts and air leakage through the building envelope.

$$ – $$$ 438 – 876 1 to 5 Clean multiple supply grilles, a filter, and 1 exterior intake grille

Balanced Airflow Systems
Name / Description Cost Energy (kWh/year) Fan (cfm/watt) Maintenance

B1: Central Air Handler with Fully Integrated HRV
An HRV is connected to the HVAC air handler and depends on the air handler fan to move tempered outdoor air through the HVAC ducts. Exhaust air is drawn from the return air duct.

$$$ – $$$$ 1,168 – 2,511 0.5 to 2 Clean multiple supply registers, air handler filter, HRV filter, and 1 exterior intake grille

B2: Central Air Handler with Partially Integrated HRV
An HRV is connected to the HVAC air handler and depends on the air handler fan to move tempered outdoor air through the HVAC ducts. Exhaust air is drawn from dedicated grilles.

$$$ – $$$$$ 1,168 – 2,511 0.5 to 2 Clean multiple supply registers, air handler filter, HRV filter, and 1 exterior intake grille

B3: Dedicated HRV Ducting
An HRV with dedicated exhaust and supply ducts moves the tempered outdoor air through supply ducts. The exhaust air is drawn from dedicated grilles.

$$$$ – $$$$$$ 438 – 1,051 0.5 to 2 Clean multiple supply and return grilles, 1 or 2 HRV filters, and 1 exterior intake grille

B4: Central Air Handler with Integrated ERV
An ERV is connected to the air handler and depends on the air handler fan to move the tempered outdoor air through the HVAC ducts. The exhaust air is drawn from the return air duct or from dedicated grilles.

$$$ – $$$$$ 1,168 – 2,511 0.5 to 1 Clean multiple supply registers, air handler filter, ERV filter, and 1 exterior intake grille

B5: Dedicated ERV Ducting
An ERV with dedicated exhaust and supply ducts moves tempered outdoor air through supply ducts. The exhaust air is drawn from dedicated grilles.

$$$$ – $$$$$$ 438 – 1,051 0.5 to 2 Clean multiple supply and return grilles, 1 or 2 ERV filters, and 1 exterior intake grille

B6: Single Point Supply and Exhaust
A supply fan brings outdoor air into the home, and a second fan with similar airflow exhausts stale air to the outside. (E1 + S1)

$$ – $$$$ 88 – 1,314 1 to 10 Clean 1 supply grille, 1 exhaust grille, and 1 exterior intake grille

B7: Multiple Point Supply and Single Exhaust
E1 + (S2 or S3 or S4)

$$ – $$$$ 140 – 1,752 1 to 10 Clean multiple supply grilles, a supply filter, an exhaust grille, and 1 exterior intake grille

B8: Single Point Supply and Multiple Point Exhaust
(E2 or E3) + S1

$$ – $$$$$ 123 – 1,752 1 to 10 Clean 1 supply grille and filter, 1 exterior intake grille, and multiple exhaust grilles

B9: Multiple Point Supply and Exhaust
(E2 or E3) + (S2 or S3 or S4)

$$$ – $$$$$ 508 – 1,752 1 to 10 Clean multiple supply grilles, the supply filter, 1 exterior intake grille, and multiple exhaust grilles