High eff furnace vent


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Should the PVC intake and exhast lines for my hi-eff furnace have screens over them, or will it effect the air flow. What stops birds from building a nest in either of these 4" pipes?
Thanks.
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Manufacturers' recommendations are *the* gospel when it comes to such questions. Your equiptment is no longer UL listed or approved by any underwriter unless those instructions are followed to the Tee. There is no room for after-the-fact-engineering in dangerous equiptment installs.
HTH

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Screens? No! 1/4" Hardware Cloth, Yes!
Effect Flow? Screens definitely Hardware Cloth some/not much
Stops Birds? Screens Yes Hardware Cloth Yes CO yes, run furnace all summer. Cats tied to flue, for a while. Feed cats when birds run out...
goodluck geothermaljones

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