Question 1

does it leave any crack when shut, through which roaches could come in?

Accepted Answer

No cracks and there are even magnets in the door to make sure it stays shut. The magnets are pretty powerful too. So much that my cat could barely get through and I had to demagnetize the door so she could use it. No roaches can get in unless they're like HULK roaches. And if that's the case you may have another problem on your hands.

Question 2

the bottom half of my screen door is thin aluminum, would this work for it as well?

Accepted Answer

I also have an aluminum panel in the lower part of the screen and have used this car door.  I cut a piece out to the same size as the inside of the door frame.  Drill the frame holes in the aluminum and without taking the cat door apart, use SS bolts thru the frame and secure it on the outside of the aluminum door panel with cap nuts. The bolts must be shortened if the cap nuts do not tighten against the panel.  I never had a problem with the door after installation.

Question 3

Does it come with a lock? In case you want to keep your pet outside for some reason?

Accepted Answer

If your cat wants in, it will just claw the screen and tear it open and come on in. Screen in door isn't very strong.

Question 4

It that fit for a median dog, weight about 30 lb?

Accepted Answer

I think 30 pounds is too big.  I use it for two cats.  One cat weighs 7-8 pounds and the other cat weighs 5 pounds and it is perfect for them.  You would need a much larger door.  You have to use reinforcement bars to make it sturdy especially with a dog.  Maybe this one is a better fit:http://www.amazon.com/Gate-Way-Pet-Door-Screens/dp/B0018C7ZRU/ref=sr_1_1?s=pet-supplies&ie=UTF8&qid=1396423804&sr=1-1&keywords=screen+door+mediumPlease look at the pictures I posted for the reinforcement.  Pictures 2,3,4,5 & 8 are of our door installed.  I posted notes on two of the pictures.  Before installing, pick up Heavy Duty Pet Mesh and add two layers to make door much stronger.  I hope this helps!http://www.amazon.com/gp/customer-media/product-gallery/B00023N7TG/ref=cm_cr_dp_cust_img_see_all_img1

ASIN	B00023N7TG
Best Sellers Rank	#48,892 in Pet Supplies ( See Top 100 in Pet Supplies ) #10 in Doors
Brand	PetSafe
Closure Type	Snap
Colour	Brown
Customer Reviews	4.2 4.2 out of 5 stars (6,681)
Dog Breed Size	Medium
Enclosure Material	Plastic
Frame Material	Metal,Plastic
Global Trade Identification Number	00081208302004
Included Components	Exterior frame, Flat-head screws, Interior frame with flap and locks, Pet Screen Door
Item Type Name	PetSafe® Pet Screen Door
Item Weight	0.75 Pounds
Manufacturer	PetSafe
Manufacturer Part Number	P1-ZB-11
Manufacturer Warranty Description	yes
Maximum Compatible Thickness	11.44 Inches
Minimum Compatible Thickness	1 Inches
Model number	P1-ZB-11
Number of Items	1
Number of Packs	1
Pet Type	Cat, Dog
Size	Small (Pack of 1)
Target Audience	Cats
UPC	081208302004
Unit Count	1.0 Count
Weight Capacity Maximum	30 Pounds

PetSafe Pet Screen Door, Bronze

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