How do you hang it from the ceiling of there is no hook? Is this provided with anything to hang?

I ran down to the local hardware store and had to purchase a screw hook. Then attached to ceiling.

is the mesh small enough to keep out blackflies?

Sue, thanks for the interest. I am told by Coghlan's that this net will keep out blackflies.

Does the door fasten ?

IF you mean the opening of the net, the model I got does not fasten, but there was plenty of overlap of the two sides so that was not an issue at all. I suppose one could add some kind of closures or may use clothespins, but I did not find that at all necessary. I closed the overlapping sides with care, and no mosquitoes were able to navigate the generous overlap and get inside! I found this a really great mosquito net and was very happy inside it!

Color	Multicolor
Size	One Size
Style	Hikers
Height	3 inches
Length	6 inches
Weight	1 Pounds
Width	10 inches
Shape	6-inch
Material Type	Polyester
Number of Items	1
Sport	Camping & Hiking
Included Components	Hikers Mosquito Net
Batteries Included?	No
Brand	Coghlan's
Department	mens
Manufacturer	Coghlan's
Item model number	9775
Product Dimensions	2.54 x 2.54 x 2.54 cm; 50 g
ASIN	B000HGMNOS

Mosquito Net

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