Specification Sheet

Rinnai Corporation • 103 International Drive • Peachtree City, GA 30269 • Toll-Free: 1-800-621-9419 • Fax: [phone] • www.rinnai.us
4 SP-CV-02 (2/13)
COMMON VENT SYSTEM
Parts / Kits
Rinnai PN Description Ø Diameter Length/Other
790020 CVent Extension, D8 x L18 8" 18"
790021 CVent Extension, D8 x L39 8" 39"
790022 CVent Elbow D8 x 45degree (2 in a box) 8" 45°
790023 CVent Elbow D8 x 90degree 8" 87°
790024 CVent 8-in Brackets 8"
790025 Centrocerin lubricant
790035 CVent Extension, D4 x L18 4" 18"
790028 CVent Extension, D4 x L39 4" 39"
790029 CVent Elbow D8 x 90degree Vertical Support 8"
790030 CVent 8-in Chase Cover 8"
790031 CVent 8-in Vent Distancer, stainless steel 8"
790034 CVent 8-in Vent Rain Cap 8"
790032 Inverter Coupling Kit with condensate trap 8"
780037 Combustion Air PVC Adapter Kit 8"
Number of
water
heaters
Percent
De-rated
Total BTU Rate
Manifold Pressure
Btu’s at
Minimum Rate
(without MSB)
Btu’s at
Minimum Rate
(with MSB)
Maximum
Rate “W.C.
Minimum
Rate “W.C.
1 0% 199,000 3.0 0.42 15,200
15,200
2 1% 394,000 3.1 0.42 30,400
3 1.5% 588,000 3.1 0.42 45,600
4 2% 780,000 3.1 0.42 60,800
5 2.5% 970,000 3.2 0.45 76,000
6 3% 1,158,000 3.2 0.45 91,200
7 3.5% 1,344,000 3.2 0.45 106,400
8 4% 1,528,000 3.2 0.45 121,600
Water heaters using CVent will automatically de-rate according to the table below.
Maximum Equivalent Vent Length
Number of water
heaters
Minimum Equivalent Vent Length Maximum Equivalent Vent Length
Exhaust* Intake* Exhaust* Intake*
1 to 7 5 ft 15 ft 100 ft 100 ft
8 5 ft 15 ft 41 ft 41 ft
When determining equivalent exhaust and intake vent
lengths add:
• 6 feet for each 90° elbow
• 3 feet for each 45° elbow
• 3 feet for the termination
• Add any vent extension lengths which are added
within the header due to increased spacing of the
water heaters
• Header kits have already been counted and do
not need to be added.
*Approved exhaust and intake diameter is 8 inches.
De-Rate