Lennox FCM 85 Installation, Operating And Maintenance page 40

ENERGY RECOVERY INSTALLATION
STEP 5 : Fixing
When the module is well fitted, fix the corner structures to the rooftop by using self-
Self-drilling screws 32mm D4.8
drilling screws 32mm
And fix the top of the module to the rooftop by using self-driling screws 19mm
Self-drilling screws 19mm D6.3
FLEXYII_WSHP-IOM-0909-E Page 38