The best replacement for direct vent is b vent.

The best alternatives to direct vent are rated as following:
★★★★★  b vent
★★★★★  vent free
★★★★  power vent
★★★  ventless fireplace
★★  chimney
★★  ventless
★  natural vent
★  vent free fireplaces
★  vent free fireplace
★  b vent fireplace
★  power vent water heater
★  non direct vent
★  top vent
  natural draft
  atmospheric vent
  sealed combustion
  indirect vent
  b vent fireplaces
  b-vent
  ventless gas fireplace
  ventless fireplaces

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direct vent
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