Operating instructions
VENTILATOR HOOD 
REPLACE PREFILTER and REPLACE FILTER PACK indicator lights 
provide a timely warning that a system shut-down is imminent. The 
actual time between the indicator light coming on and the loss of 
cooking appliance power will depend upon the cooking conditions. 
Anytime a dirty PRE-FILTER is replaced, the system airflow will 
increase. If the condition of the FILTER PACK is marginal, the 
REPLACE FILTER PACK light could then come on. If this happens, a 
fresh FILTER PACK must be installed within a reasonably short time. 
Loss of airflow through the old filter pack will soon cause a system 
shut-down when the airflow falls below minimum vapor capture levels. 
KEEP A SPARE FILTER PACK ON HAND. 
IMPORTANT: If you decide to “get the most” out of the old filter pack, 
and continue to use it until a system shut-down happens, it is advisable 
to have a fresh filter pack readily at hand, and have someone available 
who is capable of replacing it. Otherwise, you may experience an 
extended down time, with consequent associated loss of business. 
The manufacturer assumes no liability for loss of business due to 
a system shutdown caused by a dirty pre-filter and/or filter pack 
(i.e. red SERVICE REQUIRED light is on), when the user fails to 
have the proper replacement pre-filter and/or filter pack on hand. 
WARNING: 
FIRE AND HEALTH 
HAZARDS 
DO NOT bypass or attempt to 
bypass the filter placement 
interlocks. Operating the 
appliance without filters properly 
in place will compromise the fire 
protection and air filtration 
capabilities of this unit. 
Serious personal injury and/or 
substantial property damage may 
result. 
NOTICE: 
Operating without all filters 
properly in place, and/or 
operating with filter placement 
interlocks defeated will void the 
manufacturer’s warranty. 
IMPORTANT: 
NEVER wash the PREFILTER or 
FILTER PACK.This will shut 
down the cooking appliance. 
(Red “SERVICE REQUIRED” 
light will turn ON). 
HOOD SECTION - OPERATIONAL NOTES 
8 
SV504 SvcManual WV-4H(RW) 










