Or just fit an inline fan in the loft, with a fancy (or not) grill above the above.
I prefer uinline fans in the loft as they are far quieter. They also are usually more powerful as they are mixed flow or centrafugal rather than the crappy axial fans.
I prefer uinline fans in the loft as they are far quieter. They also are usually more powerful as they are mixed flow or centrafugal rather than the crappy axial fans.