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A mine ventilation structure is disclosed. The structure comprises a deck including a plurality of elongate sheet metal panels. Each panel is generally of inverted channel shape in transverse cross-section, having a top web and first and second sides extending down from the top web. The panels are c

A mine ventilation structure is disclosed. The structure comprises a deck including a plurality of elongate sheet metal panels. Each panel is generally of inverted channel shape in transverse cross-section, having a top web and first and second sides extending down from the top web. The panels are connected by tongue-and-groove connections between adjacent sides of adjacent panels. A mine ventilation deck panel of desired construction is also disclosed.

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1. A mine ventilation structure comprising a deck including a plurality of elongate sheet metal panels,each panel being generally of inverted channel shape in transverse cross-section, the panel having a top web and first and second sides extending down from the top web,the panels extending alongsid

1. A mine ventilation structure comprising a deck including a plurality of elongate sheet metal panels,each panel being generally of inverted channel shape in transverse cross-section, the panel having a top web and first and second sides extending down from the top web,the panels extending alongside one another and the top webs of the panels forming a deck surface,tongue-and-groove connections between adjacent sides of adjacent panels,each tongue-and-groove connection comprising a tongue formed in a first side of one panel received in a groove formed in a second side of an adjacent panel to effect a transfer of a load on the deck from the one panel to the adjacent panel,wherein at least one of the tongue-and-groove connections is a tapered tongue-and-groove connection, andwherein the tongue of the at least one tapered tongue-and-groove connection tapers toward an outer end of the tongue at a tongue taper angle in the range of about 60-120 degrees. 2. The mine ventilation structure of claim 1, wherein the groove of the at least one tapered tongue-and-groove connection tapers toward an inner end of the groove at a groove taper angle substantially the same as the tongue taper angle. 3. The mine ventilation structure of claim 1, wherein a common central axis of the tongue and groove of each panel of said plurality of panels is located below a neutral axis of the panel. 4. The mine ventilation structure of claim 3, wherein each panel of said plurality of panels further comprises in-turned flanges at lower ends of the first and second sides of the panel, and wherein the tongue and groove of the panel is located closely adjacent within 0.5-1.0 in. of respective in-turned flanges. 5. The mine ventilation structure of claim 1, wherein each panel is made of sheet metal, wherein the tongue comprises upper and lower walls projecting outward from the first side of the panel from an inner end of the tongue to a tongue end wall at an outer end of the tongue, and wherein the groove comprises upper and lower walls extending inward from the second side of the panel from an open outer end of the groove to a groove end wall at an inner end of the groove. 6. The mine ventilation structure of claim 1, further comprising a sealant positioned in a gap between walls of the tongue and groove of the tapered tongue-and-groove connection. 7. The mine ventilation structure of claim 6, wherein the sealant comprises an elongate member of resilient material. 8. A mine ventilation structure comprising a deck including a plurality of elongate sheet metal panels,each panel being generally of inverted channel shape in transverse cross-section, the panel having a top web and first and second sides extending down from the top web,the panels extending alongside one another and the top webs of the panels forming a deck surface,tongue-and-groove connections between adjacent sides of adjacent panels,each to connection comprising a tongue formed in a first side of one panel received in a groove formed in a second side of an adjacent panel,a sealant positioned in a gap between walls of the tongue and groove of the tongue-and-groove connection,the sealant comprising an elongate member of resilient material, andwherein the elongate member comprises a hollow body of rubber. 9. The mine ventilation structure of claim 8, wherein the hollow body is tubular. 10. The mine ventilation structure of claim 8, wherein the hollow body is adhesively secured to an end wall of the groove of the tongue-and-groove connection. 11. A plurality of mine ventilation deck panels, each deck panel of said plurality of deck panels being generally of inverted channel shape in transverse cross-section and comprising a top web,first and second sides extending down from the top web,a tongue on the first side for reception in a groove of a first adjacent deck panel alongside the first side,a groove in the second side for receiving a tongue of a second adjacent deck panel alongside the second side,wherein each deck panel of the plurality of deck panels is free of any structure preventing the reception of the tongue of the deck panel in the groove of another deck panel of the plurality of deck panels, andwherein the tongue tapers toward an about 60-120 degrees. 12. The mine ventilation deck panels of claim 11, wherein the tongue and groove are tapered. 13. The mine ventilation deck panels of claim 12, wherein the groove has a groove taper angle substantially the same as the tongue taper angle. 14. The mine ventilation deck panels of claim 11, wherein the tongue and groove are located below a neutral axis of the deck panel. 15. The mine ventilation deck panels of claim 14, wherein each deck panel of the plurality of deck panels further comprises in-turned flanges at lower ends of the first and second sides of the deck panel, and wherein the tongue and groove of the panel are located closely adjacent respective in-turned flanges. 16. The mine ventilation deck panels of claim 11, wherein the tongue and groove are located below a neutral axis of the deck panel. 17. The mine ventilation deck panels of claim 16, wherein each deck panel of the plurality of deck panels further comprises in-turned flanges at lower ends of the first and second sides of the deck panel, and wherein the tongue and groove of the deck panel are located closely adjacent within 0.5-1.0 in. respective in-turned flanges. 18. The mine ventilation deck panels of claim 11, wherein each deck panel of the plurality of deck panels is made of sheet metal, wherein the tongue comprises upper and lower walls projecting outward from the first side of the deck panel to a tongue end wall, and the groove comprises upper and lower walls extending inward from said second side of the deck panel to a groove end wall. 19. A mine ventilation structure comprising a deck including a plurality of elongate sheet metal panels,each panel being generally of inverted channel shape in transverse cross-section, the panel having a top web, first and second sides extending down from the top web, and in-turned flanges at lower ends of the first and second sides of the panel,the panels extending alongside one another and the top webs of the panels forming a deck surface,tongue-and-groove connections between adjacent sides of adjacent panels,each tongue-and-groove connection comprising a tongue formed in a first side of one panel received in a groove formed in a second side of an adjacent panel,wherein each panel further comprises in-turned flanges at lower ends of the first and second sides of the panel, andwherein the tongue and groove of the panel is located closely adjacent within 0.5-1.0 in. of respective in-turned flanges.