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The Bees have conceded just 54 goals in 43 league games, the sixth best record in League One, and kept a remarkable 22 clean sheets to compensate for their shot-shy attack, who have scored just 51 goals.
Only champions Luton (43), promoted Hull (49), fellow play-off contenders Tranmere and Bristol City (both 53) and, surprisingly, Colchester (48) have conceded less than the Bees.
Allen admitted: "Our defence has been the big thing for us this season - we've kept 22 clean sheets."
He reserved special mention for defender Sam Sodje, who has also scored an impressive seven goals.
"It's a good contribution," said Allen. "He's done very well, I'm pleased with him."