mfi heat exchager question

[47silver]

i am cleaning up the mfi heat exchangers and in the one tube that leads to the intrake air filter warmup device there was a screen in that outlet but it was completely gone, is there a replacement or does someone have a suggestion of what size screen to use?

[Flat6pac]

The rear section on the heat box was considered the “street sweeper” and many people disconnected the piping because it would clog the air filter.
Bruce