Spring Air Systems Truflow-TC Installation and Operating May 2021
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Truflo -TC automatically changes the exhaust and supply to suit the actual cooking operation at any given
time during the cooking day.
Automatic Design
The TRUFLOW-TC is an automatic design that ill modulate the fan speed based on the rise and fall of
the duct-collar air temperature. If at any time during the cooking operation, the exhaust volume of air does
not keep up to smoke generated simply touch the MAX AIR button on the DASHBOARD screen. This
situation could occur hen:
Large quantities of greasy foods are tossed on the grill at one time or
A large tilting skillet or kettle is opened quickly or
A combination oven door is opened ithout releasing steam slo ly at door or
A draft from a door or indo opening.
Minimum duct velocity in the Building Code
The National Fire Protection Association, NFPA-96 2001, code changed to provide for a
reduction of the exhaust air from a commercial kitchen during lo demand periods. The
minimum duct velocity in the NFPA-96 2001 has been reduced from 1500 fpm to 500 fpm. In
addition, the International Mechanical Code, IMC, as changed in 2003 to allo for the
reduction in exhaust from a commercial kitchen during lo demand periods. The building and
fire departments have these codes in their possession and ill have no reason not to allo a
Truflo -TC installation any here in North America.
Sizing the Exhaust Ductwork
We recommend that the engineer size the exhaust duct ork for 1670 fpm velocity. The NPFA-96 code
allo s for a reduction in duct velocity to 500 fpm. By sizing the duct ork at 1670 for 100% exhaust and
duct velocity ill be 500 fpm at 30% exhaust volume.
How many hoods can be connected to each exhaust fan
The Truflo -TC is available for connecting up to t o exhaust fans ith t o supply fans and, a total of 12
exhaust hoods. You could have t o fans ith six hoods each or one fan ith t elve hoods. Maximum
energy savings ill be achieved ith t o fans and six hoods each arrangement, because the fans ould
operate as independent kitchens.
NFPA-96, 2001
8.2 Airflo
International Mechanical
Code. 2003
Section 507 Commercial
Kitchen Hoods
