Attaching The Evaporative Cooler Duct Work To The Concrete Pad

Last year I received a Master Cool evaporative cooler for free. I purchased some duct work from a local home improvement store but never permanently attached it. I had used duct tape to hold the whole mess together last year. Duct tape does a poor job of sticking to concrete.

This year I came up with a method of attaching the duct work by installing concrete bolts and bolting down extruded aluminum L channel to the concrete. I considered gluing the aluminum directly to the concrete but I wanted to have the option to remove it in the future.

Broken concrete drill bit

I learned a few things about drilling through concrete. First: it takes a lot of power and my cordless Dewalt drill had a tough time with the drilling. It was just really slow (perhaps a lithium ion nano battery would have helped). I was meaning to buy a corded hammer drill anyway and the corded drill was 10 times faster. Second: it was easier to drill the holes in the aluminum L channel then use that as a template for drilling the concrete, rather than marking the concrete. The drill bit tended to walk a little in the concrete. Third: drilling concrete is hard on the drill bits. It’s good to have extra on hand.


I attached double sided window and door weather stripping to the aluminum L channel but left the paper backing on the other side. I filled in any remaining gaps with some outdoor rated silicon sealant.


I am far from done with this project. I need to verify that water is not leaking into the duct. I need to have someone clean all the duct work so I have not completely sealed the duct to the aluminum L channel. I want to install some sort of concrete sealant to the duct once it’s cleaned out.

Finally, I want to build a better stand for the cooler. I envision a wheeled stand with a built-in jack so I can easily move the cooler around for maintenance and adjust its height without additional help.


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