Issue:
Pieces of the gaskets are loose or falling off.  

Product Line: 
Vertical Exhaust Duct Kits

Environment: 
All versions and serial ranges 

Cause: 
If the gasket is not installed properly it will not adhere. 

Resolution:
The installation manual has been updated with instructions for correctly installing gaskets to the top of the duct, and NetShelter door frame.
You can also find a gasket installation video from Trim-Lok at this link: https://www.trimlok.com/rsinstall 
There is also a document attached below that explains correct installation of the gasket. 

Spare Gaskets: 
We may have 8.4m pieces of the gasket used on the door frame in stock as spare part 0J-827-0292A. 
We do not have spares for the gasket used atop the duct. It's Trim-Lok pn: X-1153HT-SINGLE. (HT, Black, single) Trim-Lok sells this by the 1,000 foot box.
https://www.trimlok.com/rubber-extrusion/epdm-seal/d-profile/1153-series