Basement Renovation ???? Return air grates are available in different measurements for around $5 at home centers. Check out the dimensions of available grates and frame the accesses marginally more compact. Another great Option to the walls is working with rigid foam boards. These boards are ideal for the basement https://medium.com/@a.l.e.xzhi.gl.at.y/luxury-living-below-elevate-your-toronto-home-with-a-basement-renovation-fit-for-royalty-18340e425584