Supporting the system is a critical element of any flue gas installation, and proper support is something all inspectors scrutinize.
You must use a clamshell support every 72" (2m) on vertical runs and every 39" (1m) on horizontal runs. Make sure you’re supporting within 1' before and after a horizontal offset or directional change in the system and within 2' before and after a vertical one.
InnoFlue support clamps are available in 2-12” but if you’re sourcing support clamps in the field, they must be clamshell, fit snuggly (no loose fits) and use threaded rod of at least 5/16ths/in
Base supports at the bottom of vertical stacks are handy and can serve as the sole support for up to 164’ feet of InnoFlue Single Wall, and 98’ of InnoFlue Flex.