Overview Warranty Information Reviews Product Description WhisperLine®WhisperLine® 4" Duct Inlet Grille. SPEC SHEET Warranty Information NO WARRANTY Product Videos Custom Field Product Reviews Write a Review Write a Review × PANASONIC FV-NLF04G WhisperLine®WhisperLine® 4" Duct Inlet Grille. Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *