NHRA RULES SECTION 20.27

Quote:

6:3 WINDOW NET
A ribbon-type or SFI Spec 27.1 mesh-type window net is
mandatory on any full-bodied car required by the rules to have a roll
cage. Window net must be securely mounted on the inside of the
roll cage, with the permanent attachment at the bottom. All
attachment points must be designed in an attempt to protect the
driver and avoid contact with track surface or guardwall.
Eyelet clips, dogleash hardware, hose clamps, etc. prohibited . Penetration
of webbing, except as performed by manufacturer, prohibited. Any
modification to net must be performed by manufacturer. A ribbon
type window net does not expire, unless it is torn or battered.




but if you have a cgae and your car is slower than the rules mandate having a cage you can skip the net.


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