The springs on the grille are not strong enough to hold the grille flush to the ceiling. Is there a solution to this? Where to purchase replacement springs?

Thanks for the question. The grille springs aren’t sold individually, but you can get a replacement grille assembly (which includes new springs). For the correct part number or to order directly, contact Panasonic Ventilation Support at 1‑866‑292‑7299 or ventfans@us.panasonic.com.