1. Researchers have been looking for the Rainbow volcanic vent system since 1994. 2. Direct-vent systems are from 75 percent to 80 percent efficient, Hahn said. 3. With a B-vent system , most of the heat goes out the vent, 4. It's a good choice for drain and vent systems and for drain traps. 5. And that's where a direct vent system comes in ." 6. Powered direct-vent systems include an exhaust fan to aid in the expulsion of combustion gasses. 7. "' Lj�sufj�ll "'is a fissure vent system and central volcano on the Sn�fellsnes Peninsula in Iceland. 8. It is used for drain and vent systems . 9. "' Vatnafj�ll "'is a long, wide basaltic fissure vent system that is located southeast of Hekla, Iceland. 10. Vent fauna need good dispersal characteristics so as to be able to colonise newly formed vent systems .
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