The pvc is gonna be considerably weaker than the conduit or metal tubing, but i would think it would be ok if you were using some lightweight blind cover. If you have a aggresive dog like mine (disobedience) that breaks on the fall and does not care what is in the way then i would not recommend a pvc blind. I dont beleive there is a big enough difference from the weight of the pvc and the metal to make a difference.