Airport Castings: Manhole Frames & Grates

Neenah Foundry offers a variety of cast iron manhole frames and grates for the airport market. Select from the list below to find the airport manhole frames and grates that fit your needs.

R-3491+

R-3491 Series

Airport Catch Basin Frame, Grate

Catalog No.
Solid Lid
Catalog No.
Open Grate
A B C E F G H J K
Frames in gray iron, grates/covers in ductile unless noted otherwise.
* Gray iron grate/cover.
R-3491-AL R-3491-AG* 21 2-1/2 18 27-1/2 5 1-1/4 1 2-7/8 1
R-3491-GL* R-3491-GG* 21 2-1/2 24 33-1/2 5 1-1/2 1 2-7/8 1
R-3491-HL R-3491-HG 29 1-3/4 27 35 6 1-1/2 1 2-7/8 1
R-3491-JL R-3491-JG 32-3/8 2 30 39-1/2 6 1-1/2 1 2-7/8 1

R-3491

  • For slab manhole construction
Catalog Number Grate Type Square Feet Open Weir Perimeter Lineal Feet
R-3491-AG G 0.9 5.5
R-3491-GG G 1.6 7.1
R-3491-HG G 1.9 7.6
R-3491-JG G 2.4 8.5

R-3492+

R-3492 Series

Airport Manhole Frame, Lid

R-3492

Catalog Number Grate Type Square Feet Open Weir Perimeter Lineal Feet
R-3492-1 G 1.6 7.1
R-3492-A1 G 2.4 8.5
Catalog No.
Solid Lid
Catalog No.
Open Grate
A AA B C E F G H Lid/Grate
Material
R-3492 R-3492-1 27 33-1/2 2-1/2 24 36 9 1-1/2 1 Gray Iron
R-3492-A R-3492-A1 32-3/8 39-1/2 2 30 42 9 1-1/2 1 Ductile Iron
  • For slab and built-up manhole construction
  • Top and bottom Flange provide complete anchorage so frame becomes an integral part of the slab. Can be gasket sealed for watertight application if specified.

R-3492-BG+

R-3492-BG

Airport Manhole Frame, Ductile Iron Grate

Catalog Number Grate Type Square Feet Open Weir Perimeter Lineal Feet
R-3492-BG G 2.6 9.9

R-3492-BG

  • For slab manhole construction.

R-3492-CG+

R-3492-CG

Airport Manhole Frame, Ductile Iron Grate

Catalog Number Grate Type Square Feet Open Weir Perimeter Lineal Feet
R-3492-CG G 2.6 9.9

R-3492-CG

  • For built-up manhole construction
  • Available with square base flange, see R-1795M.

R-3493-C+

R-3493-C

Airport Manhole Frame, Ductile Iron Grate

Catalog Number Grate Type Square Feet Open Weir Perimeter Lineal Feet
R-3493-C G 0.6 6.2

R-3493-C

  • For built-up manhole construction
  • Frame ring consists of 6 equally spaced lugs.

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