Brochure

46
Variable Fire (VF
™
) High
Efficiency Water Heaters
Venting Solutions
n All VF models feature flexible direct vent and
sidewall Category IV venting. In addition, the
VF units may be installed as Category II
appliances, allowing multiple units to be
manifolded together into a common vent
stack – giving you even more design options!
(Both Category II and IV venting systems
require corrosion-resistant, AL29-4C stainless
steel sealed venting material.)
Direct Venting*
Horizontal or vertical venting
up to 50 equivalent feet.
Draws combustion air up to
50 feet from the same pressure
zone using Category IV
vent materials.
Sidewall Venting*
Horizontal venting up to
50 equivalent feet using
Category IV vent materials.
Vertical Venting
Using Category IV
vent materials
Ducted Air Horizontal*
Vents horizontally up to 50 equivalent
feet and draws combustion air up to
50 feet from a different pressure zone
using Category IV vent materials.
Ducted Air Vertical*
Vertical venting up to 50
equivalent feet. Draws
combustion air up to 50 feet
from a different pressure
zone using Category IV
vent materials.
Common Venting*
Vents multiple units horizontally
through one vent termination and
draws combustion air from the room,
roof or sidewall. Category IV to II
conversion kit required.
*Requires optional factory-supplied vent and combustion air intakes terminals be used.
Note: For the most current VF venting distances/information, consult the VF Instruction Manual, available through your local A. O. Smith
representative, or online at www.hotwater.com
AOSCA80000 R July 2014 Commercial Catalog_108078_ResidentialFul#7A635.qxd 7/16/14 4:29 PM Page 46