what is an extension rod?

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 8827 vertical rod device is available for 7 or 8 feet tall door standard. 12", 24", 36" and 48" extension rod kits are available for taller doors (8 feet max on fire rated openings). We do no...
Up to 8' replace the top rod with part # 4270100018. 
From 8' to 9' use the part # 4270100172 extension rod kit
From 9' to 10' use part # 4270100197 extension rod kit. 
The 9927 installed on a 7'1" door requires a 12" extension rod
The extension rod could be used either on the top or bottom rods.