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I built the best DIY heat recovery ventilator I’ve seen on YouTube

I built a heat recovery ventilator (HRV) from only sheets of corrugated plastic and adhesive. EDIT: SEE PINNED COMMENT for some corrected efficiency metrics. To summarize, my HRV is actually 60% efficient (which is still decent!), not 85%. Even so, it works great! My HRV is powerful enough to deliver fresh air to most of my house, and it’s designed to use 4” thick MERV-13 filters to help keep harmful particulate (PM 2.5 and 10) out. It greatly reduces VOCs and CO2 as well. My indoor air quality has significantly improved. The cherry on top: it cost me less than $300 in materials to build! Intro - 0:00 What HRVs do - 0:32 The drawbacks of other DIY HRVs I've seen - 1:18 My HRV (THE REVEAL) - 2:58 Its performance data - 5:12 The cost of building it - 7:25 The drawbacks of my design - 7:50 Below are affiliate links, which means I earn a small commission if you make a purchase through them. This helps support the channel at no additional cost to you. Thank you for your support! The products I used for quantitative testing: Aranet4 CO2 monitor: https://amzn.to/4aCvfIA Dylos DC1100 PRO Particle counter: https://amzn.to/3V1ssmy Testo 405i hot wire anemometer: https://amzn.to/3WYn721 Necessary tools and materials (should cost $200-300 total): -4 mm coroplast sheets: https://amzn.to/4aAGmC5 -48" drywall T-square: https://amzn.to/3ytJ3I7 -Utility knife: https://amzn.to/3UOsaPO -X-ACTO knife: https://amzn.to/4bxG1kZ -Hot glue gun: https://amzn.to/44UkyQH -Hot glue: https://amzn.to/3UUIfUb -2 pack of Filtrete MERV 13 filters (I now recommend using a 1" thick filtrete instead of 4" thick filterbuy because filtrete has been shown to be superior even when thinner): https://amzn.to/450JKFh -Terrabloom 6" fan (easier to install, but not as powerful): https://amzn.to/3wZFIQD -AC infinity 6" fan (harder to install, more powerful): https://amzn.to/3VgmPSP -Pen or pencil Please like, subscribe, and comment if you're compelled to do so. Thanks for watching! My video about why I now use an ERV instead of this DIY HRV:    • HRVs vs. ERVs: Why I Ditched My DIY H...   My DIY ERV installation (step-by-step build):    • DIY Energy Recovery Ventilator Instal...   Designed by Instinct’s video (this one is most helpful for actually building):    • DIY Heat Recovery Ventilator - Full B...   AlexGs Aquarium’s video:    • DIY HRV (Heat Recovery Ventilation)   A few of you have requested CFM measurements for my HRV, so I’ve gone ahead and taken them! So, I measured the CFM at the supply outlet at various fan speeds. Here’s the data: With an anemometer distance of 6-8 inches from the outlet: -speed 1 of 8: ~100 cfm -speed 3 of 8: ~150 cfm -speed 6 of 8: ~250 cfm -speed 8 of 8: ~330 cfm