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diff --git a/Source/Parallelization/GuardCellManager.H b/Source/Parallelization/GuardCellManager.H
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+++ b/Source/Parallelization/GuardCellManager.H
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+#ifndef GUARDCELLMANAGER_H_
+#define GUARDCELLMANAGER_H_
+
+#include <AMReX_IntVect.H>
+
+/**
+ * \brief This class computes and stores the number of guard cells needed for
+ * the allocation of the MultiFabs and required for each part of the PIC loop.
+ */
+class guardCellManager{
+
+public:
+
+    /**
+     * \brief Initialize number of guard cells depending on the options used.
+     *
+     * \param do_subcycling bool, whether to use subcycling
+     * \param do_fdtd_nci_corr bool, whether to use Godfrey NCI corrector
+     * \param do_nodal bool, whether the field solver is nodal
+     * \param do_moving_window bool, whether to use moving window
+     * \param do_fft_mpi_dec bool, whether to do parallel FFTs for PSATD
+     * \param aux_is_nodal bool, true if the aux grid is nodal
+     * \param moving_window_dir direction of moving window
+     * \param nox order of current deposition
+     * \param nox_fft order of PSATD in x direction
+     * \param noy_fft order of PSATD in y direction
+     * \param noz_fft order of PSATD in z direction
+     * \param nci_corr_stencil stencil of NCI corrector
+     * \param maxwell_fdtd_solver_id if of Maxwell solver
+     * \param max_level max level of the simulation
+     */
+    void Init(
+        const bool do_subcycling,
+        const bool do_fdtd_nci_corr,
+        const bool do_nodal,
+        const bool do_moving_window,
+        const bool do_fft_mpi_dec,
+        const bool aux_is_nodal,
+        const int moving_window_dir,
+        const int nox,
+        const int nox_fft, const int noy_fft, const int noz_fft,
+        const int nci_corr_stencil,
+        const int maxwell_fdtd_solver_id,
+        const int max_level,
+        const bool exchange_all_guard_cells);
+
+    // Guard cells allocated for MultiFabs E and B
+    amrex::IntVect ng_alloc_EB = amrex::IntVect::TheZeroVector();
+    // Guard cells allocated for MultiFab J
+    amrex::IntVect ng_alloc_J = amrex::IntVect::TheZeroVector();
+    // Guard cells allocated for MultiFab Rho
+    amrex::IntVect ng_alloc_Rho = amrex::IntVect::TheZeroVector();
+    // Guard cells allocated for MultiFab F
+    amrex::IntVect ng_alloc_F = amrex::IntVect::TheZeroVector();
+
+    // Guard cells exchanged for specific parts of the PIC loop
+
+    // Number of guard cells of E and B that must exchanged before Field Solver
+    amrex::IntVect ng_FieldSolver = amrex::IntVect::TheZeroVector();
+    // Number of guard cells of F that must exchanged before Field Solver
+    amrex::IntVect ng_FieldSolverF = amrex::IntVect::TheZeroVector();
+    // Number of guard cells of E and B that must exchanged before Field Gather
+    amrex::IntVect ng_FieldGather = amrex::IntVect::TheZeroVector();
+    // Number of guard cells of E and B that must exchanged before updating the Aux grid
+    amrex::IntVect ng_UpdateAux = amrex::IntVect::TheZeroVector();
+    // Number of guard cells of all MultiFabs that must exchanged before moving window
+    amrex::IntVect ng_MovingWindow = amrex::IntVect::TheZeroVector();
+
+    // When the auxiliary grid is nodal but the field solver is staggered
+    // (typically with momentum-conserving gather with FDTD Yee solver),
+    // An extra guard cell is needed on the fine grid to do the interpolation
+    // for E and B.
+    amrex::IntVect ng_Extra = amrex::IntVect::TheZeroVector();
+};
+
+#endif // GUARDCELLMANAGER_H_