I have a portable ac that i need to connect 2 "tubes" outside .... what meterial for the "window" to cut?

Well i want to ask what can be good meterial to cut 2 hole inside to put on the window? (https://res.cloudinary.com/livingdirect/image/upload/c_limit,d_no_product_image.jpg,dpr_1.0,f_auto,t_dwsites,w_400/v1/product-images/APPK2010/APPK2010_002 those stuff..) i need something similar where i can cut them myself and put it on the window but dont know what material can be good and easy to cut... PS: I will put that on the "door" window in the kitchen (http://windowtreatmentsdesign.com/wp-content/uploads/2016/05/magnetic-window-blinds-for-steel-doors.jpg something like this)

submitted by /u/Elezen514
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