Does anyone drill holes in shadowboxes to encourage air flow? I had a customer yesterday that had a 150 year old Christening gown. She had spoken to a conservator at our state museum and received recommendations for framing it. One of the recommendations was to drill holes (1/4") in the bottom and both sides to let the air and humidity flow more freely. She recommended not drilling the top to prevent dust from settling in. I think my customer is willing to have the holes IF this is viable step in preserving the gown. Any guidance? What about the possibility of bugs getting in?