Will the Small DraftStopper fit my metal or zero clearance fireplace?
Yes. The Small DraftStopper dimensions are approximately 18″ diameter inflated. Our company researched the sizes of manufactured metal and zero-clearnace fireplaces and designed the DraftStopper to fit 99.5% of zero-clearance fireplaces. Please check your firebox just below the damper to ensure your firebox is not larger than these measurements. If the opening is smaller, the Small DraftStopper is designed to curl down on the sides to provide a good seal. FOR ROUND DAMPERS.