If I update my ‘very’ temporary ‘groundsheet’ window vent
(Currently using clips / duck tape) to a heavy-duty ‘Velcro’ and board type system,
will I still get blow-back? (Groundsheet blows back like balloon)
Not sure my new creation will be as elaborate as the above ^ from internet search, due to sourcing. (Have Tape / few boxes HD Velcro)
(I Imagine the Velcro letting rip like ‘The Incredible Hulk’
Casement 124cm x 50cm uPVC window opening outwards. (Looked at zip ones but examples are inward opening.