kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
I needed a 4" hole in my block foundation for a dryer vent. Talked to the guy who does our sprinkler coring. $200 bucks later I had a nice clean hole for the prefab vent with the anti-draft cover. He even stepped the hole for the collar. No filling, no patching, no muss, no fuss.
Unless this had to go in a specific place through the block that was not in the center of a hollow block core, you spent too much. I would have done it with a hammer in just a few minutes and likely would need no patching. Hole would not be as clean, but would be covered by the collar. I would have done it for free - plus probably more than $200 for travel to get to you .