Specifications

7
3000775 12.12
Fig. 8
If possible, the distance “A” should be equal to 3 times
the diameter of the chimney. This will improve accuracy.
3.6 Multiple Fan Installations
It is possible to install multiple fans in parallel. For details, please contact ENERVEX. The fans must be placed so
they can be opened for maintenance and chimney access.
Fig. 8 shows optimal placement.
3.7 Installation for High Temperatures
 Ifthefanisusedforapplicationswheretheuegastemperaturesexceed482°Fattheueexit,dilutionairisrequired.
 Dilutionairallowscoolairtodilutethewarmuegases.Thebestwaytointroducedilutionairisthroughabarometric
damper or draft hood mounted in the chimney system between the appliance outlet and the fan outlet. When
introducing dilution air, the fan capacity is reduced and a larger fan may be required.
3.8 Installation of Proven Draft Switch (PDS)
A safety system must be interlocked with the appliance(s). The safety system could utilize a Proven Draft Switch, a
 thermalswitchoraowswitch.
 Thedevicemustbeinterlockedwiththeheatingappliancesoitshutsdownincaseofinsufcientdraft,fanfailure 
or power failure. Please refer to the PDS-1 Installation Manual if this control is used. For more information on
alternative safety systems, please contact ENERVEX, Inc. Fig. 8 shows the location of the stack probe used with
the PDS-1. The stack probe should be installed in a location where there is at least 0.05” WC.
A safety device that prevents the heating appliance operation, in case of a power failure or
inadequate draft situation, must be installed.
Fig. 7