What would you say if I told you we can now vent ALL of our 90+ furnace up to 150 equivalent feet? You would either think I’m nuts or you would stand up and cheer (or possibly both). Well it is true. We are now approved to vent ALL of our furnaces in either 2 inch PVC, 3 inch PVC, and NOW 4 inch PVC vent pipe. That gives you 150 equivalent feet of vent and 150 equivalent feet of intake (for 2 pipe systems).
Attached below is the new vent table showing the use of 4 inch pipe. This, along with the ability to vent DOWN (from a previous blog posting — also attached), now provides you with some very nice options for installing 90+ furnaces. Keep in mind that to achieve the maximum lengths, long sweep elbows need to be used. I have included the equivalent feet chart for fittings on the extended vent table attachment.
With these changes, we hope this helps you land more jobs with the high efficiency equipment.