In compressed state, only 3 1/4" inside dimension
PROS:
- Easy to work with and install
- Very flexible
CONS:
- Much less efficient (a lot
of interior friction)
- Not allowable by most dryer manufacturers
- Has been known to not contain a lint
fire
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In compressed state, a full 4" inside dimension
PROS:
- Maintains a full 4" diameter
in compressed or bent configuration
- Smooth or smoother interior
- Very efficient and safe
- Specified by most manufacturers
- Insisted upon by numerous building
codes
CONS:
- Harder to work with and install
- Does not have the ability to twist
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