How inefficient are puller fans when used as pushers?

[240z4u]

I am aware some companies make fans that can be swapped from pushers to pullers by wiring and reversing fan blades.

My question is how big of a difference is there when you are using a fan designated as a puller wired up backwards as a pusher vs. a dedicated pusher.

I have been looking at fans and was curious about this.

Thanks guys - Evan

[Joe]

its about a 25% less flow rating

i.e. 2000cfm turns into 1500cfm when pushing.

[240z4u]

Thanks Kamin, that is exactly what I needed to know!

Evan

[Joe]

Glad to help.