Cutting a groove

[mylittlehouse]

Hello All
i recently had a new door fitted and frame in the back of my house and the new frame comes with a draft proof strip stuck to a seal that is about 3-5mm deeper than the frame.
i want to try and do this to my front door that is 100 years old and install the same stuff rather than using the p foam stuff.

my question is how can i router out a straight line.
what tools do i need as i have never used a router before.
i will practice on some other wood before i try the door frame
i understand that i will not be able to get right into the corners but i am quite good with a chisel so i can do up into the corners with a chiesel.

any advice would be great.

thanks all

 

[Norcon]

Have never done it but would have thought the router fence will do the job.

 

[big-all]

you have all sorts off problems with a router
door furniture 'lumpy paint 'not a large enough bearing area 'bearing area at an angel or not deep enough

having said that the router is the way to do it with a custom made jig after cleaning up the frame

 

[foxhole]

An old door will be out of true and those strips are for perfectly fitted door and frame, so unsuitable , a book fold draft excluder would be more useful.