# home improvement

## trailer

* [Trailers - Boulder County](https://bouldercounty.gov/records/motor-vehicle/trailers/)
* https://csp.colorado.gov/services-we-provide/get-a-vin-inspection
*

## hvac

* Fresh air
  * [Heat recovery ventilation - Wikipedia](https://en.wikipedia.org/wiki/Heat_recovery_ventilation)
  * [Reddit - The heart of the internet](https://www.reddit.com/r/buildingscience/comments/18z9q0w/window_energy_recovery_ventilator_diy/)
* Zones
  * [Amazon.com: AC Infinity 8” Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades for 8” Ducting in Range Hoods and Bathrooms Fans : Tools & Home Improvement](https://www.amazon.com/AC-Infinity-Backdraft-Spring-Loaded-Bathrooms/dp/B0842Y637Z/ref=sr_1_8?crid=1PPHHLXZ8LID4&keywords=8%2Bin%2Bspring%2Bloaded%2Bbackdraft%2Bdamper&qid=1640711102&s=hi&sprefix=8in%2Bspring%2Bloaded%2Bbackdraft%2Bdamper%2Ctools%2C76&sr=1-8&th=1)
  * [Tamarack TTi-cbd8 8 In. Backdraft Damper - Ceiling Fans - Amazon.com](https://www.amazon.com/Tamarack-TTi-CBD8-Cape-Backdraft-Damper/dp/B008D7L8H6?th=1)
