Decorative Adjustable Bathroom Fan Gap Cover/Trim Kit

Product Opportunity: Universal Bathroom Fan Gap Cover Kit

User Need Identified: The user has a new bathroom fan that's smaller than the old one, leaving an unsightly gap in the ceiling. This is a common problem during home renovations or when replacing appliances, where new fixtures don’t perfectly match the space left by the old ones. The user is looking for an easy and visually appealing way to cover this gap.

Product Suggestion: A "Universal Bathroom Fan Gap Cover Kit" or "Adjustable Ceiling Medallion for Fan Replacement."

This product would be a paintable, decorative trim piece or plate designed to cover the gap around a newly installed bathroom fan that is smaller than the original cutout.

Key Features:

  1. Material: Made from lightweight, durable, and paintable plastic (like ABS, PVC, or High-Impact Polystyrene) or thin, paintable MDF/composite wood. This allows users to match their ceiling color.
  2. Adjustability/Sizing:
    • Option A (Fixed Sizes): Offer a range of pre-cut sizes (e.g., "covers gaps up to 1 inch larger than X fan size," "covers gaps up to 2 inches larger").
    • Option B (Semi-Adjustable): A two-piece design where one piece slides over/under another to adjust the overall coverage area, or a design with breakaway/trimmable sections.
    • Option C (Modular): Straight and corner pieces that can be combined to frame the fan.
  3. Decorative Styles: Offer various styles, from a simple, flat, modern look to more traditional or ornate medallion designs, to complement different bathroom decors.
  4. Easy Installation:
    • Designed for simple DIY installation.
    • Could use strong, moisture-resistant double-sided adhesive tape for attachment to the ceiling.
    • Alternatively, it could have pre-drilled holes for small screws, or be designed to be secured by the fan housing itself (if the fan's design allows).
  5. Kit Contents: The kit could include the trim piece(s), adhesive strips/screws, and simple installation instructions.

Expected Benefits & Market Potential:

  • Solves a Common Problem: This is a frequent issue for DIY homeowners and even professional installers when exact replacement fan sizes are unavailable or a different model is chosen.
  • Aesthetic Improvement: Provides a clean, professional finish, hiding unsightly gaps, mismatched paint, or damaged drywall edges.
  • Cost-Effective: Cheaper and less labor-intensive than patching, mudding, sanding, and repainting a larger ceiling area.
  • Time-Saving: Offers a quick fix compared to more involved repair methods.
  • Broad Appeal: Targets DIY home renovators, handymen, and potentially property maintenance professionals.
  • Potential for Upselling: Different styles (basic vs. premium/decorative) could command different price points.
  • Distribution: Could be sold in hardware stores (Home Depot, Lowe's), online marketplaces (Amazon), and specialty plumbing/electrical supply stores.

Anticipated Revenue Stream: Direct sales of the product. Assuming a modest manufacturing cost, a retail price of $15-$35 (depending on size, material, and design complexity) could be achievable. Given the frequency of this problem, sales volume could be significant, especially with good marketing and visibility in DIY channels. If just 1% of the millions of bathroom renovations/fan replacements annually encountered this issue and opted for such a solution, it would represent a substantial market. For instance, if 50,000 units were sold annually at an average profit of $10 per unit, this would generate $500,000 in profit.

Origin Reddit Post

r/diy

New bathroom fan doesn’t cover the gap

Posted by u/_BearStyle05/28/2025
Today I had someone install a new bathroom fan and it is slightly smaller than my old one. What’s the best way to fill the hole in the corner. And the slight sagging in the last picture. I’ve

Top Comments

u/PushThroughThePain
Depending on the style of the bathroom, perhaps you could put some wood or MDF trim around it?
u/claimed4all
You can find an Oops Plate.  I swapped out an old round unit at my house for a typical full size square. This left 4 half moons on the edges.  I found a few place that would custom cut whit
u/FuzzyGreen6990
I believe you can get a plate to cover
u/CaptainInsane-o
If you have a 3d printer or makerspace in your area, you can solve this pretty easily just with a little trim you could print. Other than that, I think you have to decide if you want it to

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