On Wednesday, February 10, 2016 at 12:32:58 AM UTC-5, Robert Green wrote:
"DerbyDad03" wrote in message

stuff snipped

http://articles.latimes.com/1990-10-..._1_garage-door

WASHINGTON - At least 46 children have died in the last eight years
because they were struck by automatic garage doors, government safety
experts said Monday.
They urged that homeowners replace all garage doors that do not have
automatic reverse. The children were killed when closing doors did not
reopen automatically, the Consumer Product Safety Commission said.

The agency said children's lives could be safeguarded by checking the garage
door opener and having it repaired or replaced immediately if the door does
not respond to striking an object.

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Bobby G.

Thanks for the link, but that doesn't really fit the situation I was describing.

Article: GDO without automatic reverse or where automatic feature was broken.

Me: Properly working automatic reverse (implied) set at the maximum downforce.

The question is about the downforce. The downforce setting will force the door past some
level of obstruction. The question is whether or not it can be set strong enough so that
the door doesn't reverse before the death of a teenager or young adult occurs.